81275035312 has 40 divisors (see below), whose sum is σ = 161782778672. Its totient is φ = 39525408000.

The previous prime is 81275035273. The next prime is 81275035333. The reversal of 81275035312 is 21353057218.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 1789687 + ... + 1834537.

Almost surely, 2^81275035312 is an apocalyptic number.

It is an amenable number.

81275035312 is a deficient number, since it is larger than the sum of its proper divisors (80507743360).

81275035312 is a wasteful number, since it uses less digits than its factorization.

81275035312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47957 (or 47951 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 81275035312 in words is "eighty-one billion, two hundred seventy-five million, thirty-five thousand, three hundred twelve".