155715172050 has 24 divisors (see below), whose sum is σ = 386173627056. Its totient is φ = 41524045840.

The previous prime is 155715172009. The next prime is 155715172057. The reversal of 155715172050 is 50271517551.

It is a super-2 number, since 2×155715172050² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155715172057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 519050424 + ... + 519050723.

It is an arithmetic number, because the mean of its divisors is an integer number (16090567794).

Almost surely, 2^155715172050 is an apocalyptic number.

155715172050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155715172050 is an abundant number, since it is smaller than the sum of its proper divisors (230458455006).

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

155715172050 is a wasteful number, since it uses less digits than its factorization.

155715172050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038101162 (or 1038101157 counting only the distinct ones).

The product of its (nonzero) digits is 61250, while the sum is 39.

The spelling of 155715172050 in words is "one hundred fifty-five billion, seven hundred fifteen million, one hundred seventy-two thousand, fifty".