81013742961 has 8 divisors (see below), whose sum is σ = 108215800224. Its totient is φ = 53910423840.

The previous prime is 81013742959. The next prime is 81013742963. The reversal of 81013742961 is 16924731018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81013742959) and next prime (81013742963).

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

It is not a de Polignac number, because 81013742961 - 2¹ = 81013742959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81013742963) 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, 24682620 + ... + 24685901.

It is an arithmetic number, because the mean of its divisors is an integer number (13526975028).

Almost surely, 2^81013742961 is an apocalyptic number.

It is an amenable number.

81013742961 is a deficient number, since it is larger than the sum of its proper divisors (27202057263).

81013742961 is a wasteful number, since it uses less digits than its factorization.

81013742961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49369071.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 81013742961 in words is "eighty-one billion, thirteen million, seven hundred forty-two thousand, nine hundred sixty-one".