100405531661243 has 24 divisors (see below), whose sum is σ = 106858549528224. Its totient is φ = 94322834380800.

The previous prime is 100405531661233. The next prime is 100405531661263. The reversal of 100405531661243 is 342166135504001.

It is not a de Polignac number, because 100405531661243 - 2⁶ = 100405531661179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100405531661243.

It is not an unprimeable number, because it can be changed into a prime (100405531661233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332669363 + ... + 332971043.

It is an arithmetic number, because the mean of its divisors is an integer number (4452439563676).

Almost surely, 2^{100405531661243} is an apocalyptic number.

100405531661243 is a deficient number, since it is larger than the sum of its proper divisors (6453017866981).

100405531661243 is a wasteful number, since it uses less digits than its factorization.

100405531661243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303863 (or 303846 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 100405531661243 in words is "one hundred trillion, four hundred five billion, five hundred thirty-one million, six hundred sixty-one thousand, two hundred forty-three".