81667762141 has 64 divisors (see below), whose sum is σ = 103723130880. Its totient is φ = 62769611520.

The previous prime is 81667762129. The next prime is 81667762159. The reversal of 81667762141 is 14126776618.

It is a happy number.

It is not a de Polignac number, because 81667762141 - 2¹¹ = 81667760093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81667742141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22208595 + ... + 22212271.

It is an arithmetic number, because the mean of its divisors is an integer number (1620673920).

Almost surely, 2^81667762141 is an apocalyptic number.

It is an amenable number.

81667762141 is a deficient number, since it is larger than the sum of its proper divisors (22055368739).

81667762141 is a wasteful number, since it uses less digits than its factorization.

81667762141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874.

The product of its digits is 677376, while the sum is 49.

The spelling of 81667762141 in words is "eighty-one billion, six hundred sixty-seven million, seven hundred sixty-two thousand, one hundred forty-one".