81878414142152 has 64 divisors (see below), whose sum is σ = 165548578507200. Its totient is φ = 37837421429760.

The previous prime is 81878414142131. The next prime is 81878414142179. The reversal of 81878414142152 is 25124141487818.

It is a happy number.

It is a super-2 number, since 2×81878414142152² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231011423 + ... + 231365585.

It is an arithmetic number, because the mean of its divisors is an integer number (2586696539175).

Almost surely, 2^{81878414142152} is an apocalyptic number.

81878414142152 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81878414142152 is an abundant number, since it is smaller than the sum of its proper divisors (83670164365048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81878414142152 is a wasteful number, since it uses less digits than its factorization.

81878414142152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391326 (or 391322 counting only the distinct ones).

The product of its digits is 4587520, while the sum is 56.

The spelling of 81878414142152 in words is "eighty-one trillion, eight hundred seventy-eight billion, four hundred fourteen million, one hundred forty-two thousand, one hundred fifty-two".