647658372081 has 32 divisors (see below), whose sum is σ = 1019054080000. Its totient is φ = 358042991040.

The previous prime is 647658372071. The next prime is 647658372107. The reversal of 647658372081 is 180273856746.

It is not a de Polignac number, because 647658372081 - 2²² = 647654177777 is a prime.

It is a super-2 number, since 2×647658372081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647658372071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2010795 + ... + 2310543.

It is an arithmetic number, because the mean of its divisors is an integer number (31845440000).

Almost surely, 2^647658372081 is an apocalyptic number.

It is an amenable number.

647658372081 is a deficient number, since it is larger than the sum of its proper divisors (371395707919).

647658372081 is a wasteful number, since it uses less digits than its factorization.

647658372081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303109.

The product of its (nonzero) digits is 13547520, while the sum is 57.

The spelling of 647658372081 in words is "six hundred forty-seven billion, six hundred fifty-eight million, three hundred seventy-two thousand, eighty-one".