64551618 has 36 divisors (see below), whose sum is σ = 148584930. Its totient is φ = 20249856.

The previous prime is 64551577. The next prime is 64551623. The reversal of 64551618 is 81615546.

64551618 is a `hidden beast` number, since 645 + 5 + 1 + 6 + 1 + 8 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 54420129 + 10131489 = 7377^2 + 3183^2 .

It is a super-2 number, since 2×64551618² = 8333822772835848, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1003 + ... + 11406.

Almost surely, 2^64551618 is an apocalyptic number.

64551618 is an abundant number, since it is smaller than the sum of its proper divisors (84033312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64551618 is a wasteful number, since it uses less digits than its factorization.

64551618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12451 (or 12431 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 64551618 is about 8034.4021557301. The cubic root of 64551618 is about 401.1459182104.

The spelling of 64551618 in words is "sixty-four million, five hundred fifty-one thousand, six hundred eighteen".