172061647722251 has 16 divisors (see below), whose sum is σ = 196780915257024. Its totient is φ = 147377172518784.

The previous prime is 172061647722221. The next prime is 172061647722269. The reversal of 172061647722251 is 152227746160271.

It is a cyclic number.

It is not a de Polignac number, because 172061647722251 - 2²² = 172061643527947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172061647722193 and 172061647722202.

It is not an unprimeable number, because it can be changed into a prime (172061647722221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58908221 + ... + 61760033.

It is an arithmetic number, because the mean of its divisors is an integer number (12298807203564).

Almost surely, 2^{172061647722251} is an apocalyptic number.

172061647722251 is a deficient number, since it is larger than the sum of its proper divisors (24719267534773).

172061647722251 is a wasteful number, since it uses less digits than its factorization.

172061647722251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857910.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 172061647722251 in words is "one hundred seventy-two trillion, sixty-one billion, six hundred forty-seven million, seven hundred twenty-two thousand, two hundred fifty-one".