64993657 has 2 divisors, whose sum is σ = 64993658. Its totient is φ = 64993656.

The previous prime is 64993637. The next prime is 64993667. The reversal of 64993657 is 75639946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62980096 + 2013561 = 7936^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 64993657 - 2¹⁹ = 64469369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64993657.

It is not a weakly prime, because it can be changed into another prime (64993627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32496828 + 32496829.

It is an arithmetic number, because the mean of its divisors is an integer number (32496829).

Almost surely, 2^64993657 is an apocalyptic number.

It is an amenable number.

64993657 is a deficient number, since it is larger than the sum of its proper divisors (1).

64993657 is an equidigital number, since it uses as much as digits as its factorization.

64993657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 64993657 is about 8061.8643625405. The cubic root of 64993657 is about 402.0594967342.

The spelling of 64993657 in words is "sixty-four million, nine hundred ninety-three thousand, six hundred fifty-seven".