81620830626 has 16 divisors (see below), whose sum is σ = 164153628000. Its totient is φ = 27054949088.

The previous prime is 81620830619. The next prime is 81620830633. The reversal of 81620830626 is 62603802618.

It is an interprime number because it is at equal distance from previous prime (81620830619) and next prime (81620830633).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37997451 + ... + 37999598.

It is an arithmetic number, because the mean of its divisors is an integer number (10259601750).

Almost surely, 2^81620830626 is an apocalyptic number.

81620830626 is an abundant number, since it is smaller than the sum of its proper divisors (82532797374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81620830626 is a wasteful number, since it uses less digits than its factorization.

81620830626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75997233.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 81620830626 in words is "eighty-one billion, six hundred twenty million, eight hundred thirty thousand, six hundred twenty-six".