681631955419 has 2 divisors, whose sum is σ = 681631955420. Its totient is φ = 681631955418.

The previous prime is 681631955393. The next prime is 681631955447. The reversal of 681631955419 is 914559136186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681631955419 - 2²⁹ = 681095084507 is a prime.

It is a super-2 number, since 2×681631955419² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681631955819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340815977709 + 340815977710.

It is an arithmetic number, because the mean of its divisors is an integer number (340815977710).

Almost surely, 2^681631955419 is an apocalyptic number.

681631955419 is a deficient number, since it is larger than the sum of its proper divisors (1).

681631955419 is an equidigital number, since it uses as much as digits as its factorization.

681631955419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 58.

The spelling of 681631955419 in words is "six hundred eighty-one billion, six hundred thirty-one million, nine hundred fifty-five thousand, four hundred nineteen".