64155949786057 has 2 divisors, whose sum is σ = 64155949786058. Its totient is φ = 64155949786056.

The previous prime is 64155949786001. The next prime is 64155949786073. The reversal of 64155949786057 is 75068794955146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33865137029376 + 30290812756681 = 5819376^2 + 5503709^2 .

It is a cyclic number.

It is not a de Polignac number, because 64155949786057 - 2¹⁹ = 64155949261769 is a prime.

It is not a weakly prime, because it can be changed into another prime (64155949786457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32077974893028 + 32077974893029.

It is an arithmetic number, because the mean of its divisors is an integer number (32077974893029).

Almost surely, 2^{64155949786057} is an apocalyptic number.

It is an amenable number.

64155949786057 is a deficient number, since it is larger than the sum of its proper divisors (1).

64155949786057 is an equidigital number, since it uses as much as digits as its factorization.

64155949786057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144000, while the sum is 76.

The spelling of 64155949786057 in words is "sixty-four trillion, one hundred fifty-five billion, nine hundred forty-nine million, seven hundred eighty-six thousand, fifty-seven".