669951973802 has 4 divisors (see below), whose sum is σ = 1004927960706. Its totient is φ = 334975986900.

The previous prime is 669951973751. The next prime is 669951973807. The reversal of 669951973802 is 208379159966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 566333007601 + 103618966201 = 752551^2 + 321899^2 .

It is not an unprimeable number, because it can be changed into a prime (669951973807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167487993449 + ... + 167487993452.

Almost surely, 2^669951973802 is an apocalyptic number.

669951973802 is a deficient number, since it is larger than the sum of its proper divisors (334975986904).

669951973802 is a wasteful number, since it uses less digits than its factorization.

669951973802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334975986903.

The product of its (nonzero) digits is 44089920, while the sum is 65.

The spelling of 669951973802 in words is "six hundred sixty-nine billion, nine hundred fifty-one million, nine hundred seventy-three thousand, eight hundred two".