64601557 has 2 divisors, whose sum is σ = 64601558. Its totient is φ = 64601556.

The previous prime is 64601521. The next prime is 64601573. The reversal of 64601557 is 75510646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64096036 + 505521 = 8006^2 + 711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64601557 is a prime.

It is a super-2 number, since 2×64601557² = 8346722333648498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64601507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32300778 + 32300779.

It is an arithmetic number, because the mean of its divisors is an integer number (32300779).

Almost surely, 2^64601557 is an apocalyptic number.

It is an amenable number.

64601557 is a deficient number, since it is larger than the sum of its proper divisors (1).

64601557 is an equidigital number, since it uses as much as digits as its factorization.

64601557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 64601557 is about 8037.5093779105. The cubic root of 64601557 is about 401.2493375765.

The spelling of 64601557 in words is "sixty-four million, six hundred one thousand, five hundred fifty-seven".