81436913762 has 4 divisors (see below), whose sum is σ = 122155370646. Its totient is φ = 40718456880.

The previous prime is 81436913759. The next prime is 81436913801. The reversal of 81436913762 is 26731963418.

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., 62779812481 + 18657101281 = 250559^2 + 136591^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81436913762.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20359228439 + ... + 20359228442.

Almost surely, 2^81436913762 is an apocalyptic number.

81436913762 is a deficient number, since it is larger than the sum of its proper divisors (40718456884).

81436913762 is a wasteful number, since it uses less digits than its factorization.

81436913762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40718456883.

The product of its digits is 1306368, while the sum is 50.

The spelling of 81436913762 in words is "eighty-one billion, four hundred thirty-six million, nine hundred thirteen thousand, seven hundred sixty-two".