6690436644 has 24 divisors (see below), whose sum is σ = 16032939328. Its totient is φ = 2169871200.

The previous prime is 6690436637. The next prime is 6690436667. The reversal of 6690436644 is 4466340966.

It is a super-3 number, since 3×6690436644³ (a number of 30 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6690436593 and 6690436602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7533832 + ... + 7534719.

Almost surely, 2^6690436644 is an apocalyptic number.

It is an amenable number.

6690436644 is an abundant number, since it is smaller than the sum of its proper divisors (9342502684).

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

6690436644 is a wasteful number, since it uses less digits than its factorization.

6690436644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15068595 (or 15068593 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 48.

The square root of 6690436644 is about 81795.0893636042. The cubic root of 6690436644 is about 1884.3062450408.

The spelling of 6690436644 in words is "six billion, six hundred ninety million, four hundred thirty-six thousand, six hundred forty-four".