647857372745 has 32 divisors (see below), whose sum is σ = 887919822720. Its totient is φ = 449440714240.

The previous prime is 647857372663. The next prime is 647857372753. The reversal of 647857372745 is 547273758746.

It is a happy number.

It is not a de Polignac number, because 647857372745 - 2¹² = 647857368649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2314484 + ... + 2579253.

It is an arithmetic number, because the mean of its divisors is an integer number (27747494460).

Almost surely, 2^647857372745 is an apocalyptic number.

It is an amenable number.

647857372745 is a deficient number, since it is larger than the sum of its proper divisors (240062449975).

647857372745 is a wasteful number, since it uses less digits than its factorization.

647857372745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893865.

The product of its digits is 276595200, while the sum is 65.

The spelling of 647857372745 in words is "six hundred forty-seven billion, eight hundred fifty-seven million, three hundred seventy-two thousand, seven hundred forty-five".