51501221025 has 12 divisors (see below), whose sum is σ = 85148685552. Its totient is φ = 27467317840.

The previous prime is 51501221021. The next prime is 51501221053. The reversal of 51501221025 is 52012210515.

It is not a de Polignac number, because 51501221025 - 2² = 51501221021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51501220986 and 51501221004.

It is not an unprimeable number, because it can be changed into a prime (51501221021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343341399 + ... + 343341548.

It is an arithmetic number, because the mean of its divisors is an integer number (7095723796).

Almost surely, 2^51501221025 is an apocalyptic number.

It is an amenable number.

51501221025 is a deficient number, since it is larger than the sum of its proper divisors (33647464527).

51501221025 is a wasteful number, since it uses less digits than its factorization.

51501221025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686682960 (or 686682955 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 51501221025 in words is "fifty-one billion, five hundred one million, two hundred twenty-one thousand, twenty-five".