64651901 has 12 divisors (see below), whose sum is σ = 68982900. Its totient is φ = 60579840.

The previous prime is 64651883. The next prime is 64651903. The reversal of 64651901 is 10915646.

It can be written as a sum of positive squares in 6 ways, for example, as 23755876 + 40896025 = 4874^2 + 6395^2 .

It is not a de Polignac number, because 64651901 - 2¹⁴ = 64635517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64651903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100541 + ... + 101181.

It is an arithmetic number, because the mean of its divisors is an integer number (5748575).

Almost surely, 2^64651901 is an apocalyptic number.

It is an amenable number.

64651901 is a deficient number, since it is larger than the sum of its proper divisors (4330999).

64651901 is a wasteful number, since it uses less digits than its factorization.

64651901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1007 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 64651901 is about 8040.6405839336. The cubic root of 64651901 is about 401.3535417291.

The spelling of 64651901 in words is "sixty-four million, six hundred fifty-one thousand, nine hundred one".