55621375488 has 600 divisors, whose sum is σ = 195751426464. Its totient is φ = 15676416000.

The previous prime is 55621375483. The next prime is 55621375507. The reversal of 55621375488 is 88457312655.

55621375488 is a `hidden beast` number, since 5 + 5 + 62 + 1 + 37 + 548 + 8 = 666.

It is a super-2 number, since 2×55621375488² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (8064000) is a multiple of the sum of its prime divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621375483) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 205244793 + ... + 205245063.

Almost surely, 2^55621375488 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 55621375488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97875713232).

55621375488 is an abundant number, since it is smaller than the sum of its proper divisors (140130050976).

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

55621375488 is a wasteful number, since it uses less digits than its factorization.

55621375488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 384 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 55621375488 in words is "fifty-five billion, six hundred twenty-one million, three hundred seventy-five thousand, four hundred eighty-eight".