64131640847 has 4 divisors (see below), whose sum is σ = 64140546576. Its totient is φ = 64122735120.

The previous prime is 64131640819. The next prime is 64131640901. The reversal of 64131640847 is 74804613146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74804613146 = 2 ⋅37402306573.

It is a cyclic number.

It is not a de Polignac number, because 64131640847 - 2²⁶ = 64064531983 is a prime.

It is a super-2 number, since 2×64131640847² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64131640798 and 64131640807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64131640247) 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, 4442054 + ... + 4456467.

It is an arithmetic number, because the mean of its divisors is an integer number (16035136644).

Almost surely, 2^64131640847 is an apocalyptic number.

64131640847 is a deficient number, since it is larger than the sum of its proper divisors (8905729).

64131640847 is an equidigital number, since it uses as much as digits as its factorization.

64131640847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8905728.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 64131640847 in words is "sixty-four billion, one hundred thirty-one million, six hundred forty thousand, eight hundred forty-seven".