64886557 has 2 divisors, whose sum is σ = 64886558. Its totient is φ = 64886556.

The previous prime is 64886513. The next prime is 64886573. The reversal of 64886557 is 75568846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63584676 + 1301881 = 7974^2 + 1141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64886557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64886557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64886587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32443278 + 32443279.

It is an arithmetic number, because the mean of its divisors is an integer number (32443279).

Almost surely, 2^64886557 is an apocalyptic number.

It is an amenable number.

64886557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64886557 is an equidigital number, since it uses as much as digits as its factorization.

64886557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 49.

The square root of 64886557 is about 8055.2192397228. The cubic root of 64886557 is about 401.8385303186.

The spelling of 64886557 in words is "sixty-four million, eight hundred eighty-six thousand, five hundred fifty-seven".