172051720050 has 48 divisors (see below), whose sum is σ = 487643735232. Its totient is φ = 39326107200.

The previous prime is 172051720039. The next prime is 172051720051. The reversal of 172051720050 is 50027150271.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (172051720051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81928341 + ... + 81930440.

It is an arithmetic number, because the mean of its divisors is an integer number (10159244484).

Almost surely, 2^172051720050 is an apocalyptic number.

172051720050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172051720050 is an abundant number, since it is smaller than the sum of its proper divisors (315592015182).

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

172051720050 is a wasteful number, since it uses less digits than its factorization.

172051720050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163858803 (or 163858798 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 30.

The spelling of 172051720050 in words is "one hundred seventy-two billion, fifty-one million, seven hundred twenty thousand, fifty".