64659901 has 2 divisors, whose sum is σ = 64659902. Its totient is φ = 64659900.

The previous prime is 64659899. The next prime is 64659919. The reversal of 64659901 is 10995646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 4519876 = 7755^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 64659901 - 2¹ = 64659899 is a prime.

Together with 64659899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64659941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32329950 + 32329951.

It is an arithmetic number, because the mean of its divisors is an integer number (32329951).

Almost surely, 2^64659901 is an apocalyptic number.

It is an amenable number.

64659901 is a deficient number, since it is larger than the sum of its proper divisors (1).

64659901 is an equidigital number, since it uses as much as digits as its factorization.

64659901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 64659901 is about 8041.1380413471. The cubic root of 64659901 is about 401.3700954878.

The spelling of 64659901 in words is "sixty-four million, six hundred fifty-nine thousand, nine hundred one".