81491852674 has 16 divisors (see below), whose sum is σ = 122521392000. Its totient is φ = 40651441200.

The previous prime is 81491852657. The next prime is 81491852693. The reversal of 81491852674 is 47625819418.

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, 3682567 + ... + 3704629.

It is an arithmetic number, because the mean of its divisors is an integer number (7657587000).

Almost surely, 2^81491852674 is an apocalyptic number.

81491852674 is a deficient number, since it is larger than the sum of its proper divisors (41029539326).

81491852674 is a wasteful number, since it uses less digits than its factorization.

81491852674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26265.

The product of its digits is 3870720, while the sum is 55.

The spelling of 81491852674 in words is "eighty-one billion, four hundred ninety-one million, eight hundred fifty-two thousand, six hundred seventy-four".