51225546661631 has 4 divisors (see below), whose sum is σ = 51225583656000. Its totient is φ = 51225509667264.

The previous prime is 51225546661571. The next prime is 51225546661699. The reversal of 51225546661631 is 13616664552215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51225546661631 is a prime.

It is a super-2 number, since 2×51225546661631² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225546669631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16335986 + ... + 19217583.

It is an arithmetic number, because the mean of its divisors is an integer number (12806395914000).

Almost surely, 2^{51225546661631} is an apocalyptic number.

51225546661631 is a deficient number, since it is larger than the sum of its proper divisors (36994369).

51225546661631 is a wasteful number, since it uses less digits than its factorization.

51225546661631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36994368.

The product of its digits is 7776000, while the sum is 53.

The spelling of 51225546661631 in words is "fifty-one trillion, two hundred twenty-five billion, five hundred forty-six million, six hundred sixty-one thousand, six hundred thirty-one".