81114365951 has 4 divisors (see below), whose sum is σ = 81280925712. Its totient is φ = 80947806192.

The previous prime is 81114365933. The next prime is 81114365999. The reversal of 81114365951 is 15956341118.

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

It is a cyclic number.

It is not a de Polignac number, because 81114365951 - 2⁶ = 81114365887 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 (81114365251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83279150 + ... + 83280123.

It is an arithmetic number, because the mean of its divisors is an integer number (20320231428).

Almost surely, 2^81114365951 is an apocalyptic number.

81114365951 is a deficient number, since it is larger than the sum of its proper divisors (166559761).

81114365951 is a wasteful number, since it uses less digits than its factorization.

81114365951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166559760.

The product of its digits is 129600, while the sum is 44.

The spelling of 81114365951 in words is "eighty-one billion, one hundred fourteen million, three hundred sixty-five thousand, nine hundred fifty-one".