81635190998 has 16 divisors (see below), whose sum is σ = 126411040896. Its totient is φ = 39498347520.

The previous prime is 81635190997. The next prime is 81635191049. The reversal of 81635190998 is 89909153618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81635190997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229540 + ... + 1294232.

It is an arithmetic number, because the mean of its divisors is an integer number (7900690056).

Almost surely, 2^81635190998 is an apocalyptic number.

81635190998 is a deficient number, since it is larger than the sum of its proper divisors (44775849898).

81635190998 is a wasteful number, since it uses less digits than its factorization.

81635190998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85079.

The product of its (nonzero) digits is 4199040, while the sum is 59.

The spelling of 81635190998 in words is "eighty-one billion, six hundred thirty-five million, one hundred ninety thousand, nine hundred ninety-eight".