81275507026 has 16 divisors (see below), whose sum is σ = 147525290496. Its totient is φ = 32783397696.

The previous prime is 81275506993. The next prime is 81275507063. The reversal of 81275507026 is 62070557218.

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, 170746626 + ... + 170747101.

It is an arithmetic number, because the mean of its divisors is an integer number (9220330656).

Almost surely, 2^81275507026 is an apocalyptic number.

81275507026 is a deficient number, since it is larger than the sum of its proper divisors (66249783470).

81275507026 is a wasteful number, since it uses less digits than its factorization.

81275507026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341493753.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 81275507026 in words is "eighty-one billion, two hundred seventy-five million, five hundred seven thousand, twenty-six".