81762915494 has 8 divisors (see below), whose sum is σ = 132078555840. Its totient is φ = 37736730216.

The previous prime is 81762915469. The next prime is 81762915497. The reversal of 81762915494 is 49451926718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×81762915494³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81762915497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1572363734 + ... + 1572363785.

It is an arithmetic number, because the mean of its divisors is an integer number (16509819480).

Almost surely, 2^81762915494 is an apocalyptic number.

81762915494 is a deficient number, since it is larger than the sum of its proper divisors (50315640346).

81762915494 is a wasteful number, since it uses less digits than its factorization.

81762915494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144727534.

The product of its digits is 4354560, while the sum is 56.

The spelling of 81762915494 in words is "eighty-one billion, seven hundred sixty-two million, nine hundred fifteen thousand, four hundred ninety-four".