6465647538 has 48 divisors (see below), whose sum is σ = 16069337856. Its totient is φ = 1840501440.

The previous prime is 6465647521. The next prime is 6465647567. The reversal of 6465647538 is 8357465646.

6465647538 is a `hidden beast` number, since 6 + 4 + 6 + 564 + 75 + 3 + 8 = 666.

It is a super-2 number, since 2×6465647538² = 83609196171290922888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60531 + ... + 128822.

It is an arithmetic number, because the mean of its divisors is an integer number (334777872).

Almost surely, 2^6465647538 is an apocalyptic number.

6465647538 is an abundant number, since it is smaller than the sum of its proper divisors (9603690318).

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

6465647538 is a wasteful number, since it uses less digits than its factorization.

6465647538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189639 (or 189636 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The square root of 6465647538 is about 80409.2503260663. The cubic root of 6465647538 is about 1862.9620528815.

The spelling of 6465647538 in words is "six billion, four hundred sixty-five million, six hundred forty-seven thousand, five hundred thirty-eight".