81792429674 has 4 divisors (see below), whose sum is σ = 122688644514. Its totient is φ = 40896214836.

The previous prime is 81792429629. The next prime is 81792429679. The reversal of 81792429674 is 47692429718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 65353343449 + 16439086225 = 255643^2 + 128215^2 .

It is not an unprimeable number, because it can be changed into a prime (81792429679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20448107417 + ... + 20448107420.

Almost surely, 2^81792429674 is an apocalyptic number.

81792429674 is a deficient number, since it is larger than the sum of its proper divisors (40896214840).

81792429674 is a wasteful number, since it uses less digits than its factorization.

81792429674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40896214839.

The product of its digits is 12192768, while the sum is 59.

The spelling of 81792429674 in words is "eighty-one billion, seven hundred ninety-two million, four hundred twenty-nine thousand, six hundred seventy-four".