669640275 has 36 divisors (see below), whose sum is σ = 1262534520. Its totient is φ = 338342400.

The previous prime is 669640241. The next prime is 669640291. The reversal of 669640275 is 572046966.

It is not a de Polignac number, because 669640275 - 2⁶ = 669640211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 669640275.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 74046 + ... + 82595.

Almost surely, 2^669640275 is an apocalyptic number.

669640275 is a deficient number, since it is larger than the sum of its proper divisors (592894245).

669640275 is a wasteful number, since it uses less digits than its factorization.

669640275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156676 (or 156668 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 669640275 is about 25877.4085835502. The cubic root of 669640275 is about 874.8773814571.

It can be divided in two parts, 6696 and 40275, that added together give a triangular number (46971 = T₃₀₆).

The spelling of 669640275 in words is "six hundred sixty-nine million, six hundred forty thousand, two hundred seventy-five".