669801475396 has 27 divisors (see below), whose sum is σ = 1245210355837. Its totient is φ = 315187599680.

The previous prime is 669801475393. The next prime is 669801475397. The reversal of 669801475396 is 693574108966.

The square root of 669801475396 is 818414.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 521471736900 + 148329738496 = 722130^2 + 385136^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669801475393) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27814041 + ... + 27838111.

Almost surely, 2^669801475396 is an apocalyptic number.

669801475396 is the 818414-th square number.

It is an amenable number.

669801475396 is a deficient number, since it is larger than the sum of its proper divisors (575408880441).

669801475396 is an frugal number, since it uses more digits than its factorization.

669801475396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48180 (or 24090 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 64.

Multiplying 669801475396 by its sum of digits (64), we get a square (42867294425344 = 6547312²).

The spelling of 669801475396 in words is "six hundred sixty-nine billion, eight hundred one million, four hundred seventy-five thousand, three hundred ninety-six".