64603661800 has 48 divisors (see below), whose sum is σ = 159039022860. Its totient is φ = 24321377280.

The previous prime is 64603661789. The next prime is 64603661831. The reversal of 64603661800 is 816630646.

It can be written as a sum of positive squares in 6 ways, for example, as 55261666084 + 9341995716 = 235078^2 + 96654^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9497139 + ... + 9503938.

Almost surely, 2^64603661800 is an apocalyptic number.

It is an amenable number.

64603661800 is an abundant number, since it is smaller than the sum of its proper divisors (94435361060).

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

64603661800 is a wasteful number, since it uses less digits than its factorization.

64603661800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19001110 (or 19001101 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 64603661800 in words is "sixty-four billion, six hundred three million, six hundred sixty-one thousand, eight hundred".