81495252489 has 8 divisors (see below), whose sum is σ = 124183241920. Its totient is φ = 46568715696.

The previous prime is 81495252479. The next prime is 81495252493. The reversal of 81495252489 is 98425259418.

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

It is not a de Polignac number, because 81495252489 - 2⁴ = 81495252473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81495252479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940363134 + ... + 1940363175.

It is an arithmetic number, because the mean of its divisors is an integer number (15522905240).

Almost surely, 2^81495252489 is an apocalyptic number.

It is an amenable number.

81495252489 is a deficient number, since it is larger than the sum of its proper divisors (42687989431).

81495252489 is a wasteful number, since it uses less digits than its factorization.

81495252489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880726319.

The product of its digits is 8294400, while the sum is 57.

The spelling of 81495252489 in words is "eighty-one billion, four hundred ninety-five million, two hundred fifty-two thousand, four hundred eighty-nine".