81199498758 has 16 divisors (see below), whose sum is σ = 185598854400. Its totient is φ = 23199856776.

The previous prime is 81199498741. The next prime is 81199498763. The reversal of 81199498758 is 85789499118.

It is a junction number, because it is equal to n+sod(n) for n = 81199498692 and 81199498701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966660658 + ... + 966660741.

It is an arithmetic number, because the mean of its divisors is an integer number (11599928400).

Almost surely, 2^81199498758 is an apocalyptic number.

81199498758 is an abundant number, since it is smaller than the sum of its proper divisors (104399355642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81199498758 is a wasteful number, since it uses less digits than its factorization.

81199498758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933321411.

The product of its digits is 52254720, while the sum is 69.

The spelling of 81199498758 in words is "eighty-one billion, one hundred ninety-nine million, four hundred ninety-eight thousand, seven hundred fifty-eight".