647078218081 has 16 divisors (see below), whose sum is σ = 690806430720. Its totient is φ = 603988773120.

The previous prime is 647078218051. The next prime is 647078218211. The reversal of 647078218081 is 180812870746.

It is not a de Polignac number, because 647078218081 - 2¹⁷ = 647078087009 is a prime.

It is a super-2 number, since 2×647078218081² (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 (647078218021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2078080 + ... + 2369086.

It is an arithmetic number, because the mean of its divisors is an integer number (43175401920).

Almost surely, 2^647078218081 is an apocalyptic number.

It is an amenable number.

647078218081 is a deficient number, since it is larger than the sum of its proper divisors (43728212639).

647078218081 is a wasteful number, since it uses less digits than its factorization.

647078218081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292104.

The product of its (nonzero) digits is 1204224, while the sum is 52.

The spelling of 647078218081 in words is "six hundred forty-seven billion, seventy-eight million, two hundred eighteen thousand, eighty-one".