64049120857 has 2 divisors, whose sum is σ = 64049120858. Its totient is φ = 64049120856.

The previous prime is 64049120789. The next prime is 64049120869. The reversal of 64049120857 is 75802194046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57938415616 + 6110705241 = 240704^2 + 78171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64049120857 is a prime.

It is not a weakly prime, because it can be changed into another prime (64049120557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32024560428 + 32024560429.

It is an arithmetic number, because the mean of its divisors is an integer number (32024560429).

Almost surely, 2^64049120857 is an apocalyptic number.

It is an amenable number.

64049120857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64049120857 is an equidigital number, since it uses as much as digits as its factorization.

64049120857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 64049120857 in words is "sixty-four billion, forty-nine million, one hundred twenty thousand, eight hundred fifty-seven".