81140266562 has 8 divisors (see below), whose sum is σ = 122094345276. Its totient is φ = 40442151472.

The previous prime is 81140266547. The next prime is 81140266579. The reversal of 81140266562 is 26566204118.

It can be written as a sum of positive squares in 2 ways, for example, as 79619344561 + 1520922001 = 282169^2 + 38999^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63990113 + ... + 63991380.

Almost surely, 2^81140266562 is an apocalyptic number.

81140266562 is a deficient number, since it is larger than the sum of its proper divisors (40954078714).

81140266562 is a wasteful number, since it uses less digits than its factorization.

81140266562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127981812.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 81140266562 in words is "eighty-one billion, one hundred forty million, two hundred sixty-six thousand, five hundred sixty-two".