15553866240 has 480 divisors, whose sum is σ = 60967722816. Its totient is φ = 3768975360.

The previous prime is 15553866233. The next prime is 15553866247. The reversal of 15553866240 is 4266835551.

15553866240 is a `hidden beast` number, since 1 + 55 + 538 + 6 + 62 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (15553866233) and next prime (15553866247).

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (15553866247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6841744 + ... + 6844016.

Almost surely, 2^15553866240 is an apocalyptic number.

15553866240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15553866240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30483861408).

15553866240 is an abundant number, since it is smaller than the sum of its proper divisors (45413856576).

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

15553866240 is an equidigital number, since it uses as much as digits as its factorization.

15553866240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322 (or 2294 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 15553866240 in words is "fifteen billion, five hundred fifty-three million, eight hundred sixty-six thousand, two hundred forty".