81400302369 has 12 divisors (see below), whose sum is σ = 120079879296. Its totient is φ = 53112253752.

The previous prime is 81400302349. The next prime is 81400302499. The reversal of 81400302369 is 96320300418.

It is not a de Polignac number, because 81400302369 - 2¹¹ = 81400300321 is a prime.

It is a super-2 number, since 2×81400302369² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81400302349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96217429 + ... + 96218274.

It is an arithmetic number, because the mean of its divisors is an integer number (10006656608).

Almost surely, 2^81400302369 is an apocalyptic number.

It is an amenable number.

81400302369 is a deficient number, since it is larger than the sum of its proper divisors (38679576927).

81400302369 is a wasteful number, since it uses less digits than its factorization.

81400302369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192435756 (or 192435753 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 81400302369 in words is "eighty-one billion, four hundred million, three hundred two thousand, three hundred sixty-nine".