81940659753 has 16 divisors (see below), whose sum is σ = 115703985600. Its totient is φ = 51403501056.

The previous prime is 81940659751. The next prime is 81940659781. The reversal of 81940659753 is 35795604918.

It is not a de Polignac number, because 81940659753 - 2¹ = 81940659751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81940659693 and 81940659702.

It is not an unprimeable number, because it can be changed into a prime (81940659751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102501 + ... + 417597.

It is an arithmetic number, because the mean of its divisors is an integer number (7231499100).

Almost surely, 2^81940659753 is an apocalyptic number.

It is an amenable number.

81940659753 is a deficient number, since it is larger than the sum of its proper divisors (33763325847).

81940659753 is a wasteful number, since it uses less digits than its factorization.

81940659753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320216.

The product of its (nonzero) digits is 8164800, while the sum is 57.

The spelling of 81940659753 in words is "eighty-one billion, nine hundred forty million, six hundred fifty-nine thousand, seven hundred fifty-three".