81369940162 has 16 divisors (see below), whose sum is σ = 139504432320. Its totient is φ = 34869554928.

The previous prime is 81369940147. The next prime is 81369940177. The reversal of 81369940162 is 26104996318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81369940147) and next prime (81369940177).

It is a super-3 number, since 3×81369940162³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115593 + ... + 419644.

It is an arithmetic number, because the mean of its divisors is an integer number (8719027020).

Almost surely, 2^81369940162 is an apocalyptic number.

81369940162 is a deficient number, since it is larger than the sum of its proper divisors (58134492158).

81369940162 is a wasteful number, since it uses less digits than its factorization.

81369940162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546105.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 81369940162 in words is "eighty-one billion, three hundred sixty-nine million, nine hundred forty thousand, one hundred sixty-two".