101638617794 has 24 divisors (see below), whose sum is σ = 179177373900. Its totient is φ = 43110337536.

The previous prime is 101638617781. The next prime is 101638617833. The reversal of 101638617794 is 497716836101.

It can be written as a sum of positive squares in 2 ways, for example, as 89797913569 + 11840704225 = 299663^2 + 108815^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5336519 + ... + 5355530.

Almost surely, 2^101638617794 is an apocalyptic number.

101638617794 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

101638617794 is a deficient number, since it is larger than the sum of its proper divisors (77538756106).

101638617794 is a wasteful number, since it uses less digits than its factorization.

101638617794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692162 (or 10692155 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 101638617794 in words is "one hundred one billion, six hundred thirty-eight million, six hundred seventeen thousand, seven hundred ninety-four".