5144645664 has 60 divisors (see below), whose sum is σ = 15130267614. Its totient is φ = 1714881024.

The previous prime is 5144645647. The next prime is 5144645687. The reversal of 5144645664 is 4665464415.

It can be written as a sum of positive squares in only one way, i.e., 3856410000 + 1288235664 = 62100^2 + 35892^2 .

It is a super-2 number, since 2×5144645664² = 52934758016228001792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 989817 + ... + 995000.

Almost surely, 2^5144645664 is an apocalyptic number.

5144645664 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

5144645664 is an abundant number, since it is smaller than the sum of its proper divisors (9985621950).

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

5144645664 is a wasteful number, since it uses less digits than its factorization.

5144645664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984839 (or 1984822 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The square root of 5144645664 is about 71726.1853439872. The cubic root of 5144645664 is about 1726.3088199323.

The spelling of 5144645664 in words is "five billion, one hundred forty-four million, six hundred forty-five thousand, six hundred sixty-four".