81051737685 has 32 divisors (see below), whose sum is σ = 138978512640. Its totient is φ = 40230609408.

The previous prime is 81051737617. The next prime is 81051737687. The reversal of 81051737685 is 58673715018.

It is not a de Polignac number, because 81051737685 - 2¹⁴ = 81051721301 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81051737687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3162000 + ... + 3187529.

It is an arithmetic number, because the mean of its divisors is an integer number (4343078520).

Almost surely, 2^81051737685 is an apocalyptic number.

It is an amenable number.

81051737685 is a deficient number, since it is larger than the sum of its proper divisors (57926774955).

81051737685 is a wasteful number, since it uses less digits than its factorization.

81051737685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6349597.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 81051737685 in words is "eighty-one billion, fifty-one million, seven hundred thirty-seven thousand, six hundred eighty-five".