669663562 has 4 divisors (see below), whose sum is σ = 1004495346. Its totient is φ = 334831780.

The previous prime is 669663559. The next prime is 669663587. The reversal of 669663562 is 265366966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 265366966 = 2 ⋅132683483.

It can be written as a sum of positive squares in only one way, i.e., 641051761 + 28611801 = 25319^2 + 5349^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167415889 + ... + 167415892.

Almost surely, 2^669663562 is an apocalyptic number.

669663562 is a deficient number, since it is larger than the sum of its proper divisors (334831784).

669663562 is a wasteful number, since it uses less digits than its factorization.

669663562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334831783.

The product of its digits is 2099520, while the sum is 49.

The square root of 669663562 is about 25877.8585280931. The cubic root of 669663562 is about 874.8875227395.

The spelling of 669663562 in words is "six hundred sixty-nine million, six hundred sixty-three thousand, five hundred sixty-two".