64656475 has 12 divisors (see below), whose sum is σ = 86341696. Its totient is φ = 47746080.

The previous prime is 64656451. The next prime is 64656479. The reversal of 64656475 is 57465646.

It is a happy number.

It is not a de Polignac number, because 64656475 - 2⁹ = 64655963 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64656479) 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, 99147 + ... + 99796.

Almost surely, 2^64656475 is an apocalyptic number.

64656475 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64656475 is a deficient number, since it is larger than the sum of its proper divisors (21685221).

64656475 is a wasteful number, since it uses less digits than its factorization.

64656475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198966 (or 198961 counting only the distinct ones).

The product of its digits is 604800, while the sum is 43.

The square root of 64656475 is about 8040.9250089775. The cubic root of 64656475 is about 401.3630065078.

It can be divided in two parts, 646 and 56475, that added together give a square (57121 = 239²).

The spelling of 64656475 in words is "sixty-four million, six hundred fifty-six thousand, four hundred seventy-five".