81265980635 has 16 divisors (see below), whose sum is σ = 114462664896. Its totient is φ = 54219155328.

The previous prime is 81265980629. The next prime is 81265980643. The reversal of 81265980635 is 53608956218.

It is a cyclic number.

It is not a de Polignac number, because 81265980635 - 2⁴ = 81265980619 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31375532 + ... + 31378121.

It is an arithmetic number, because the mean of its divisors is an integer number (7153916556).

Almost surely, 2^81265980635 is an apocalyptic number.

81265980635 is a deficient number, since it is larger than the sum of its proper divisors (33196684261).

81265980635 is a wasteful number, since it uses less digits than its factorization.

81265980635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62753702.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 81265980635 in words is "eighty-one billion, two hundred sixty-five million, nine hundred eighty thousand, six hundred thirty-five".