251020203122155 has 8 divisors (see below), whose sum is σ = 301508149731984. Its totient is φ = 200626891840800.

The previous prime is 251020203122147. The next prime is 251020203122237. The reversal of 251020203122155 is 551221302020152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 251020203122155 - 2³ = 251020203122147 is a prime.

It is a super-2 number, since 2×251020203122155² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23658826281 + ... + 23658836890.

It is an arithmetic number, because the mean of its divisors is an integer number (37688518716498).

Almost surely, 2^{251020203122155} is an apocalyptic number.

251020203122155 is a deficient number, since it is larger than the sum of its proper divisors (50487946609829).

251020203122155 is a wasteful number, since it uses less digits than its factorization.

251020203122155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47317664237.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 251020203122155 in words is "two hundred fifty-one trillion, twenty billion, two hundred three million, one hundred twenty-two thousand, one hundred fifty-five".