81107751257399 has 8 divisors (see below), whose sum is σ = 84955978179072. Its totient is φ = 77286341248600.

The previous prime is 81107751257371. The next prime is 81107751257443. The reversal of 81107751257399 is 99375215770118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81107751257399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81107751250399) 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, 6704222027 + ... + 6704234124.

It is an arithmetic number, because the mean of its divisors is an integer number (10619497272384).

Almost surely, 2^{81107751257399} is an apocalyptic number.

81107751257399 is a deficient number, since it is larger than the sum of its proper divisors (3848226921673).

81107751257399 is a wasteful number, since it uses less digits than its factorization.

81107751257399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13408456437.

The product of its (nonzero) digits is 33339600, while the sum is 65.

The spelling of 81107751257399 in words is "eighty-one trillion, one hundred seven billion, seven hundred fifty-one million, two hundred fifty-seven thousand, three hundred ninety-nine".