65625557 has 2 divisors, whose sum is σ = 65625558. Its totient is φ = 65625556.

The previous prime is 65625503. The next prime is 65625643. The reversal of 65625557 is 75552656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64866916 + 758641 = 8054^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 65625557 - 2⁶ = 65625493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65625257) 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, 32812778 + 32812779.

It is an arithmetic number, because the mean of its divisors is an integer number (32812779).

Almost surely, 2^65625557 is an apocalyptic number.

It is an amenable number.

65625557 is a deficient number, since it is larger than the sum of its proper divisors (1).

65625557 is an equidigital number, since it uses as much as digits as its factorization.

65625557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 315000, while the sum is 41.

The square root of 65625557 is about 8100.9602517232. The cubic root of 65625557 is about 403.3583026835.

The spelling of 65625557 in words is "sixty-five million, six hundred twenty-five thousand, five hundred fifty-seven".