81698146705 has 16 divisors (see below), whose sum is σ = 116914616064. Its totient is φ = 53585864640.

The previous prime is 81698146681. The next prime is 81698146787. The reversal of 81698146705 is 50764189618.

It is not a de Polignac number, because 81698146705 - 2²⁷ = 81563928977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50743386 + ... + 50744995.

It is an arithmetic number, because the mean of its divisors is an integer number (7307163504).

Almost surely, 2^81698146705 is an apocalyptic number.

It is an amenable number.

81698146705 is a deficient number, since it is larger than the sum of its proper divisors (35216469359).

81698146705 is a wasteful number, since it uses less digits than its factorization.

81698146705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101488416.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 81698146705 in words is "eighty-one billion, six hundred ninety-eight million, one hundred forty-six thousand, seven hundred five".