81925427376 has 160 divisors (see below), whose sum is σ = 253381768640. Its totient is φ = 25194240000.

The previous prime is 81925427341. The next prime is 81925427377. The reversal of 81925427376 is 67372452918.

It is a happy number.

81925427376 is a `hidden beast` number, since 8 + 1 + 92 + 542 + 7 + 3 + 7 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (81925427377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16851186 + ... + 16856046.

It is an arithmetic number, because the mean of its divisors is an integer number (1583636054).

Almost surely, 2^81925427376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81925427376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126690884320).

81925427376 is an abundant number, since it is smaller than the sum of its proper divisors (171456341264).

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

81925427376 is a wasteful number, since it uses less digits than its factorization.

81925427376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7892 (or 7880 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

It can be divided in two parts, 8192542 and 7376, that added together give a palindrome (8199918).

The spelling of 81925427376 in words is "eighty-one billion, nine hundred twenty-five million, four hundred twenty-seven thousand, three hundred seventy-six".