81476267418 has 128 divisors (see below), whose sum is σ = 223998297600. Its totient is φ = 21376659456.

The previous prime is 81476267399. The next prime is 81476267429.

81476267418 is a `hidden beast` number, since 8 + 1 + 4 + 7 + 626 + 7 + 4 + 1 + 8 = 666.

81476267418 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 905448 + ... + 991356.

It is an arithmetic number, because the mean of its divisors is an integer number (1749986700).

Almost surely, 2^81476267418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81476267418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111999148800).

81476267418 is an abundant number, since it is smaller than the sum of its proper divisors (142522030182).

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

81476267418 is a wasteful number, since it uses less digits than its factorization.

81476267418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86133 (or 86127 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The spelling of 81476267418 in words is "eighty-one billion, four hundred seventy-six million, two hundred sixty-seven thousand, four hundred eighteen".