81542856662 has 64 divisors (see below), whose sum is σ = 137063370240. Its totient is φ = 36204537600.

The previous prime is 81542856631. The next prime is 81542856767. The reversal of 81542856662 is 26665824518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14978513 + ... + 14983955.

It is an arithmetic number, because the mean of its divisors is an integer number (2141615160).

Almost surely, 2^81542856662 is an apocalyptic number.

81542856662 is a deficient number, since it is larger than the sum of its proper divisors (55520513578).

81542856662 is a wasteful number, since it uses less digits than its factorization.

81542856662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829.

The product of its digits is 5529600, while the sum is 53.

The spelling of 81542856662 in words is "eighty-one billion, five hundred forty-two million, eight hundred fifty-six thousand, six hundred sixty-two".