81040493762 has 8 divisors (see below), whose sum is σ = 121574231100. Its totient is φ = 40515750064.

The previous prime is 81040493761. The next prime is 81040493791. The reversal of 81040493762 is 26739404018.

It can be written as a sum of positive squares in 2 ways, for example, as 77840442001 + 3200051761 = 278999^2 + 56569^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81040493761) 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 in 3 ways as a sum of consecutive naturals, for example, 2225837 + ... + 2261952.

Almost surely, 2^81040493762 is an apocalyptic number.

81040493762 is a deficient number, since it is larger than the sum of its proper divisors (40533737338).

81040493762 is a wasteful number, since it uses less digits than its factorization.

81040493762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496820.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 81040493762 in words is "eighty-one billion, forty million, four hundred ninety-three thousand, seven hundred sixty-two".