6690946915 has 4 divisors (see below), whose sum is σ = 8029136304. Its totient is φ = 5352757528.

The previous prime is 6690946897. The next prime is 6690946963. The reversal of 6690946915 is 5196490966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5196490966 = 2 ⋅2598245483.

It is a cyclic number.

It is not a de Polignac number, because 6690946915 - 2⁵ = 6690946883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669094687 + ... + 669094696.

It is an arithmetic number, because the mean of its divisors is an integer number (2007284076).

Almost surely, 2^6690946915 is an apocalyptic number.

6690946915 is a deficient number, since it is larger than the sum of its proper divisors (1338189389).

6690946915 is a wasteful number, since it uses less digits than its factorization.

6690946915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338189388.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The square root of 6690946915 is about 81798.2085072772. The cubic root of 6690946915 is about 1884.3541483611.

The spelling of 6690946915 in words is "six billion, six hundred ninety million, nine hundred forty-six thousand, nine hundred fifteen".