64697639401 has 2 divisors, whose sum is σ = 64697639402. Its totient is φ = 64697639400.

The previous prime is 64697639359. The next prime is 64697639443. The reversal of 64697639401 is 10493679646.

It is a balanced prime because it is at equal distance from previous prime (64697639359) and next prime (64697639443).

It can be written as a sum of positive squares in only one way, i.e., 54216794025 + 10480845376 = 232845^2 + 102376^2 .

It is a cyclic number.

It is not a de Polignac number, because 64697639401 - 2¹⁹ = 64697115113 is a prime.

It is not a weakly prime, because it can be changed into another prime (64697639491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32348819700 + 32348819701.

It is an arithmetic number, because the mean of its divisors is an integer number (32348819701).

Almost surely, 2^64697639401 is an apocalyptic number.

It is an amenable number.

64697639401 is a deficient number, since it is larger than the sum of its proper divisors (1).

64697639401 is an equidigital number, since it uses as much as digits as its factorization.

64697639401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 64697639401 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred one".