81700774674 has 16 divisors (see below), whose sum is σ = 173013405408. Its totient is φ = 25631615552.

The previous prime is 81700774663. The next prime is 81700774699. The reversal of 81700774674 is 47647700718.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 400493892 + ... + 400494095.

It is an arithmetic number, because the mean of its divisors is an integer number (10813337838).

Almost surely, 2^81700774674 is an apocalyptic number.

81700774674 is an abundant number, since it is smaller than the sum of its proper divisors (91312630734).

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

81700774674 is a wasteful number, since it uses less digits than its factorization.

81700774674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800988009.

The product of its (nonzero) digits is 1843968, while the sum is 51.

The spelling of 81700774674 in words is "eighty-one billion, seven hundred million, seven hundred seventy-four thousand, six hundred seventy-four".