6696639564 has 12 divisors (see below), whose sum is σ = 15625492344. Its totient is φ = 2232213184.

The previous prime is 6696639559. The next prime is 6696639569. The reversal of 6696639564 is 4659366966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6696639559) and next prime (6696639569).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×6696639564² = 89689962900260220192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6696639498 and 6696639507.

It is not an unprimeable number, because it can be changed into a prime (6696639569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279026637 + ... + 279026660.

It is an arithmetic number, because the mean of its divisors is an integer number (1302124362).

Almost surely, 2^6696639564 is an apocalyptic number.

It is an amenable number.

6696639564 is an abundant number, since it is smaller than the sum of its proper divisors (8928852780).

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

6696639564 is a wasteful number, since it uses less digits than its factorization.

6696639564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558053304 (or 558053302 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 60.

The square root of 6696639564 is about 81832.9980142485. The cubic root of 6696639564 is about 1884.8883989024. Note that the first 3 decimals are identical.

The spelling of 6696639564 in words is "six billion, six hundred ninety-six million, six hundred thirty-nine thousand, five hundred sixty-four".