81146057709 has 32 divisors (see below), whose sum is σ = 113159854080. Its totient is φ = 51657294528.

The previous prime is 81146057693. The next prime is 81146057723. The reversal of 81146057709 is 90775064118.

It is not a de Polignac number, because 81146057709 - 2⁴ = 81146057693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81146057779) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7369402 + ... + 7380404.

It is an arithmetic number, because the mean of its divisors is an integer number (3536245440).

Almost surely, 2^81146057709 is an apocalyptic number.

It is an amenable number.

81146057709 is a deficient number, since it is larger than the sum of its proper divisors (32013796371).

81146057709 is a wasteful number, since it uses less digits than its factorization.

81146057709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11961.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 81146057709 in words is "eighty-one billion, one hundred forty-six million, fifty-seven thousand, seven hundred nine".