669692658 has 16 divisors (see below), whose sum is σ = 1409879520. Its totient is φ = 211481856.

The previous prime is 669692641. The next prime is 669692663. The reversal of 669692658 is 856296966.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669692598 and 669692607.

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, 2937135 + ... + 2937362.

It is an arithmetic number, because the mean of its divisors is an integer number (88117470).

Almost surely, 2^669692658 is an apocalyptic number.

669692658 is an abundant number, since it is smaller than the sum of its proper divisors (740186862).

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

669692658 is a wasteful number, since it uses less digits than its factorization.

669692658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5874521.

The product of its digits is 8398080, while the sum is 57.

The square root of 669692658 is about 25878.4207014261. The cubic root of 669692658 is about 874.9001934596.

The spelling of 669692658 in words is "six hundred sixty-nine million, six hundred ninety-two thousand, six hundred fifty-eight".