721677124087 has 2 divisors, whose sum is σ = 721677124088. Its totient is φ = 721677124086.

The previous prime is 721677124067. The next prime is 721677124111. The reversal of 721677124087 is 780421776127.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721677124087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721677124067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360838562043 + 360838562044.

It is an arithmetic number, because the mean of its divisors is an integer number (360838562044).

Almost surely, 2^721677124087 is an apocalyptic number.

721677124087 is a deficient number, since it is larger than the sum of its proper divisors (1).

721677124087 is an equidigital number, since it uses as much as digits as its factorization.

721677124087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1843968, while the sum is 52.

The spelling of 721677124087 in words is "seven hundred twenty-one billion, six hundred seventy-seven million, one hundred twenty-four thousand, eighty-seven".