81074182372 has 12 divisors (see below), whose sum is σ = 141886138156. Its totient is φ = 40535285760.

The previous prime is 81074182349. The next prime is 81074182379. The reversal of 81074182372 is 27328147018.

It can be written as a sum of positive squares in 2 ways, for example, as 6033250276 + 75040932096 = 77674^2 + 273936^2 .

It is not an unprimeable number, because it can be changed into a prime (81074182379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347673 + ... + 532000.

Almost surely, 2^81074182372 is an apocalyptic number.

It is an amenable number.

81074182372 is a deficient number, since it is larger than the sum of its proper divisors (60811955784).

81074182372 is a wasteful number, since it uses less digits than its factorization.

81074182372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902718 (or 902716 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 81074182372 in words is "eighty-one billion, seventy-four million, one hundred eighty-two thousand, three hundred seventy-two".