721819370087 has 2 divisors, whose sum is σ = 721819370088. Its totient is φ = 721819370086.

The previous prime is 721819370009. The next prime is 721819370177. The reversal of 721819370087 is 780073918127.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721819370087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721819370887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360909685043 + 360909685044.

It is an arithmetic number, because the mean of its divisors is an integer number (360909685044).

Almost surely, 2^721819370087 is an apocalyptic number.

721819370087 is a deficient number, since it is larger than the sum of its proper divisors (1).

721819370087 is an equidigital number, since it uses as much as digits as its factorization.

721819370087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 721819370087 in words is "seven hundred twenty-one billion, eight hundred nineteen million, three hundred seventy thousand, eighty-seven".