53449987155840 has 1152 divisors, whose sum is σ = 222764830011360. Its totient is φ = 12195289497600.

The previous prime is 53449987155839. The next prime is 53449987155841. The reversal of 53449987155840 is 4855178994435.

53449987155840 is a `hidden beast` number, since 5 + 3 + 4 + 499 + 8 + 7 + 1 + 55 + 84 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (53449987155839) and next prime (53449987155841).

It is a tau number, because it is divible by the number of its divisors (1152).

It is a super-2 number, since 2×53449987155840² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53449987155841) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 319821100 + ... + 319988180.

Almost surely, 2^{53449987155840} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53449987155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111382415005680).

53449987155840 is an abundant number, since it is smaller than the sum of its proper divisors (169314842855520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53449987155840 is a wasteful number, since it uses less digits than its factorization.

53449987155840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167154 (or 167119 counting only the distinct ones).

The product of its (nonzero) digits is 870912000, while the sum is 72.

The spelling of 53449987155840 in words is "fifty-three trillion, four hundred forty-nine billion, nine hundred eighty-seven million, one hundred fifty-five thousand, eight hundred forty".