816357580631 has 4 divisors (see below), whose sum is σ = 816364836000. Its totient is φ = 816350325264.

The previous prime is 816357580627. The next prime is 816357580639. The reversal of 816357580631 is 136085753618.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816357580631 - 2² = 816357580627 is a prime.

It is a super-2 number, since 2×816357580631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816357580639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3456206 + ... + 3684843.

It is an arithmetic number, because the mean of its divisors is an integer number (204091209000).

Almost surely, 2^816357580631 is an apocalyptic number.

816357580631 is a deficient number, since it is larger than the sum of its proper divisors (7255369).

816357580631 is a wasteful number, since it uses less digits than its factorization.

816357580631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255368.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 816357580631 in words is "eight hundred sixteen billion, three hundred fifty-seven million, five hundred eighty thousand, six hundred thirty-one".