81680009626 has 16 divisors (see below), whose sum is σ = 122709202560. Its totient is φ = 40776976800.

The previous prime is 81680009617. The next prime is 81680009627. The reversal of 81680009626 is 62690008618.

It is not an unprimeable number, because it can be changed into a prime (81680009627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6475726 + ... + 6488326.

It is an arithmetic number, because the mean of its divisors is an integer number (7669325160).

Almost surely, 2^81680009626 is an apocalyptic number.

81680009626 is a deficient number, since it is larger than the sum of its proper divisors (41029192934).

81680009626 is a wasteful number, since it uses less digits than its factorization.

81680009626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 81680009626 in words is "eighty-one billion, six hundred eighty million, nine thousand, six hundred twenty-six".