81117249562 has 8 divisors (see below), whose sum is σ = 121707514656. Its totient is φ = 40548078012.

The previous prime is 81117249557. The next prime is 81117249571. The reversal of 81117249562 is 26594271118.

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, 5263768 + ... + 5279155.

It is an arithmetic number, because the mean of its divisors is an integer number (15213439332).

Almost surely, 2^81117249562 is an apocalyptic number.

81117249562 is a deficient number, since it is larger than the sum of its proper divisors (40590265094).

81117249562 is a wasteful number, since it uses less digits than its factorization.

81117249562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10546772.

The product of its digits is 241920, while the sum is 46.

The spelling of 81117249562 in words is "eighty-one billion, one hundred seventeen million, two hundred forty-nine thousand, five hundred sixty-two".