81758653582 has 16 divisors (see below), whose sum is σ = 129681707904. Its totient is φ = 38595744000.

The previous prime is 81758653553. The next prime is 81758653601. The reversal of 81758653582 is 28535685718.

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, 16079019 + ... + 16084102.

It is an arithmetic number, because the mean of its divisors is an integer number (8105106744).

Almost surely, 2^81758653582 is an apocalyptic number.

81758653582 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81758653582 is a deficient number, since it is larger than the sum of its proper divisors (47923054322).

81758653582 is a wasteful number, since it uses less digits than its factorization.

81758653582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32163195.

The product of its digits is 16128000, while the sum is 58.

The spelling of 81758653582 in words is "eighty-one billion, seven hundred fifty-eight million, six hundred fifty-three thousand, five hundred eighty-two".