64681013651 has 2 divisors, whose sum is σ = 64681013652. Its totient is φ = 64681013650.

The previous prime is 64681013633. The next prime is 64681013669. The reversal of 64681013651 is 15631018646.

It is a balanced prime because it is at equal distance from previous prime (64681013633) and next prime (64681013669).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64681013651 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 64681013599 and 64681013608.

It is not a weakly prime, because it can be changed into another prime (64681073651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32340506825 + 32340506826.

It is an arithmetic number, because the mean of its divisors is an integer number (32340506826).

Almost surely, 2^64681013651 is an apocalyptic number.

64681013651 is a deficient number, since it is larger than the sum of its proper divisors (1).

64681013651 is an equidigital number, since it uses as much as digits as its factorization.

64681013651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 64681013651 in words is "sixty-four billion, six hundred eighty-one million, thirteen thousand, six hundred fifty-one".