81537746120626 has 16 divisors (see below), whose sum is σ = 122611214147904. Its totient is φ = 40667414427504.

The previous prime is 81537746120591. The next prime is 81537746120669. The reversal of 81537746120626 is 62602164773518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16020940 + ... + 20487703.

It is an arithmetic number, because the mean of its divisors is an integer number (7663200884244).

Almost surely, 2^{81537746120626} is an apocalyptic number.

81537746120626 is a deficient number, since it is larger than the sum of its proper divisors (41073468027278).

81537746120626 is a wasteful number, since it uses less digits than its factorization.

81537746120626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36511425.

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 81537746120626 in words is "eighty-one trillion, five hundred thirty-seven billion, seven hundred forty-six million, one hundred twenty thousand, six hundred twenty-six".