672005051668 has 6 divisors (see below), whose sum is σ = 1176008840426. Its totient is φ = 336002525832.

The previous prime is 672005051659. The next prime is 672005051699. The reversal of 672005051668 is 866150500276.

It can be written as a sum of positive squares in only one way, i.e., 551080553104 + 120924498564 = 742348^2 + 347742^2 .

It is a super-2 number, since 2×672005051668² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84000631455 + ... + 84000631462.

Almost surely, 2^672005051668 is an apocalyptic number.

It is an amenable number.

672005051668 is a deficient number, since it is larger than the sum of its proper divisors (504003788758).

672005051668 is a wasteful number, since it uses less digits than its factorization.

672005051668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168001262921 (or 168001262919 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 672005051668 in words is "six hundred seventy-two billion, five million, fifty-one thousand, six hundred sixty-eight".