155297973600 has 864 divisors, whose sum is σ = 712810627200. Its totient is φ = 32267289600.

The previous prime is 155297973577. The next prime is 155297973619. The reversal of 155297973600 is 6379792551.

155297973600 is a `hidden beast` number, since 1 + 5 + 5 + 29 + 7 + 9 + 7 + 3 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 11635731 + ... + 11649069.

It is an arithmetic number, because the mean of its divisors is an integer number (825012300).

Almost surely, 2^155297973600 is an apocalyptic number.

155297973600 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 155297973600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356405313600).

155297973600 is an abundant number, since it is smaller than the sum of its proper divisors (557512653600).

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

155297973600 is a wasteful number, since it uses less digits than its factorization.

155297973600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13393 (or 13367 counting only the distinct ones).

The product of its (nonzero) digits is 3572100, while the sum is 54.

The spelling of 155297973600 in words is "one hundred fifty-five billion, two hundred ninety-seven million, nine hundred seventy-three thousand, six hundred".