977643673 has 2 divisors, whose sum is σ = 977643674. Its totient is φ = 977643672.

The previous prime is 977643619. The next prime is 977643703. The reversal of 977643673 is 376346779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893591449 + 84052224 = 29893^2 + 9168^2 .

It is a cyclic number.

It is not a de Polignac number, because 977643673 - 2²¹ = 975546521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 977643673.

It is not a weakly prime, because it can be changed into another prime (977646673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488821836 + 488821837.

It is an arithmetic number, because the mean of its divisors is an integer number (488821837).

Almost surely, 2^977643673 is an apocalyptic number.

It is an amenable number.

977643673 is a deficient number, since it is larger than the sum of its proper divisors (1).

977643673 is an equidigital number, since it uses as much as digits as its factorization.

977643673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 52.

The square root of 977643673 is about 31267.2939826906. The cubic root of 977643673 is about 992.4916568784.

The spelling of 977643673 in words is "nine hundred seventy-seven million, six hundred forty-three thousand, six hundred seventy-three".