3656694667 has 4 divisors (see below), whose sum is σ = 3725688960. Its totient is φ = 3587700376.

The previous prime is 3656694659. The next prime is 3656694689. The reversal of 3656694667 is 7664966563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7664966563 = 65963 ⋅116201.

It is a cyclic number.

It is not a de Polignac number, because 3656694667 - 2³ = 3656694659 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656694637) 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, 34497067 + ... + 34497172.

It is an arithmetic number, because the mean of its divisors is an integer number (931422240).

Almost surely, 2^3656694667 is an apocalyptic number.

3656694667 is a deficient number, since it is larger than the sum of its proper divisors (68994293).

3656694667 is an equidigital number, since it uses as much as digits as its factorization.

3656694667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68994292.

The product of its digits is 29393280, while the sum is 58.

The square root of 3656694667 is about 60470.6099440050. The cubic root of 3656694667 is about 1540.6224878492.

The spelling of 3656694667 in words is "three billion, six hundred fifty-six million, six hundred ninety-four thousand, six hundred sixty-seven".