81328618274 has 16 divisors (see below), whose sum is σ = 122292369216. Its totient is φ = 40564592400.

The previous prime is 81328618249. The next prime is 81328618291. The reversal of 81328618274 is 47281682318.

It is a super-2 number, since 2×81328618274² (a number of 23 digits) contains 22 as substring.

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, 1726859 + ... + 1773329.

It is an arithmetic number, because the mean of its divisors is an integer number (7643273076).

Almost surely, 2^81328618274 is an apocalyptic number.

81328618274 is a deficient number, since it is larger than the sum of its proper divisors (40963750942).

81328618274 is a wasteful number, since it uses less digits than its factorization.

81328618274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48601.

The product of its digits is 1032192, while the sum is 50.

The spelling of 81328618274 in words is "eighty-one billion, three hundred twenty-eight million, six hundred eighteen thousand, two hundred seventy-four".