672997900621 has 2 divisors, whose sum is σ = 672997900622. Its totient is φ = 672997900620.

The previous prime is 672997900541. The next prime is 672997900633. The reversal of 672997900621 is 126009799276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581757052900 + 91240847721 = 762730^2 + 302061^2 .

It is a cyclic number.

It is not a de Polignac number, because 672997900621 - 2⁷ = 672997900493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672997901621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336498950310 + 336498950311.

It is an arithmetic number, because the mean of its divisors is an integer number (336498950311).

Almost surely, 2^672997900621 is an apocalyptic number.

It is an amenable number.

672997900621 is a deficient number, since it is larger than the sum of its proper divisors (1).

672997900621 is an equidigital number, since it uses as much as digits as its factorization.

672997900621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 672997900621 in words is "six hundred seventy-two billion, nine hundred ninety-seven million, nine hundred thousand, six hundred twenty-one".