651105051656 has 48 divisors (see below), whose sum is σ = 1252201104900. Its totient is φ = 317389698560.

The previous prime is 651105051557. The next prime is 651105051671. The reversal of 651105051656 is 656150501156.

It can be written as a sum of positive squares in 6 ways, for example, as 173947384900 + 477157666756 = 417070^2 + 690766^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20061650 + ... + 20094078.

Almost surely, 2^651105051656 is an apocalyptic number.

It is an amenable number.

651105051656 is a deficient number, since it is larger than the sum of its proper divisors (601096053244).

651105051656 is a wasteful number, since it uses less digits than its factorization.

651105051656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34010 (or 33965 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 651105051656 in words is "six hundred fifty-one billion, one hundred five million, fifty-one thousand, six hundred fifty-six".