721677125087 has 2 divisors, whose sum is σ = 721677125088. Its totient is φ = 721677125086.

The previous prime is 721677125083. The next prime is 721677125173. The reversal of 721677125087 is 780521776127.

It is a happy number.

721677125087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721677125087 - 2² = 721677125083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721677125083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360838562543 + 360838562544.

It is an arithmetic number, because the mean of its divisors is an integer number (360838562544).

Almost surely, 2^721677125087 is an apocalyptic number.

721677125087 is a deficient number, since it is larger than the sum of its proper divisors (1).

721677125087 is an equidigital number, since it uses as much as digits as its factorization.

721677125087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304960, while the sum is 53.

The spelling of 721677125087 in words is "seven hundred twenty-one billion, six hundred seventy-seven million, one hundred twenty-five thousand, eighty-seven".