81051707455 has 4 divisors (see below), whose sum is σ = 97262048952. Its totient is φ = 64841365960.

The previous prime is 81051707357. The next prime is 81051707497. The reversal of 81051707455 is 55470715018.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81051707455 - 2¹⁵ = 81051674687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8105170741 + ... + 8105170750.

It is an arithmetic number, because the mean of its divisors is an integer number (24315512238).

Almost surely, 2^81051707455 is an apocalyptic number.

81051707455 is a deficient number, since it is larger than the sum of its proper divisors (16210341497).

81051707455 is a wasteful number, since it uses less digits than its factorization.

81051707455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16210341496.

The product of its (nonzero) digits is 196000, while the sum is 43.

The spelling of 81051707455 in words is "eighty-one billion, fifty-one million, seven hundred seven thousand, four hundred fifty-five".