155640105250 has 128 divisors (see below), whose sum is σ = 336347002368. Its totient is φ = 52825593600.

The previous prime is 155640105223. The next prime is 155640105259. The reversal of 155640105250 is 52501046551.

It is not an unprimeable number, because it can be changed into a prime (155640105259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87094857 + ... + 87096643.

It is an arithmetic number, because the mean of its divisors is an integer number (2627710956).

Almost surely, 2^155640105250 is an apocalyptic number.

155640105250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155640105250 is an abundant number, since it is smaller than the sum of its proper divisors (180706897118).

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

155640105250 is a wasteful number, since it uses less digits than its factorization.

155640105250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2275 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 155640105250 in words is "one hundred fifty-five billion, six hundred forty million, one hundred five thousand, two hundred fifty".