81274010164 has 24 divisors (see below), whose sum is σ = 145920237120. Its totient is φ = 39594705024.

The previous prime is 81274010143. The next prime is 81274010201. The reversal of 81274010164 is 46101047218.

It is a happy number.

It is a congruent number.

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, 1497144 + ... + 1550479.

It is an arithmetic number, because the mean of its divisors is an integer number (6080009880).

Almost surely, 2^81274010164 is an apocalyptic number.

It is an amenable number.

81274010164 is a deficient number, since it is larger than the sum of its proper divisors (64646226956).

81274010164 is a wasteful number, since it uses less digits than its factorization.

81274010164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047799 (or 3047797 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 81274010164 in words is "eighty-one billion, two hundred seventy-four million, ten thousand, one hundred sixty-four".