9181838291920 has 40 divisors (see below), whose sum is σ = 24397456034304. Its totient is φ = 3148058842752.

The previous prime is 9181838291903. The next prime is 9181838291959. The reversal of 9181838291920 is 291928381819.

It is a tau number, because it is divible by the number of its divisors (40).

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, 8198069344 + ... + 8198070463.

Almost surely, 2^{9181838291920} is an apocalyptic number.

It is an amenable number.

9181838291920 is an abundant number, since it is smaller than the sum of its proper divisors (15215617742384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9181838291920 is a wasteful number, since it uses less digits than its factorization.

9181838291920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16396139827 (or 16396139821 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 61.

The spelling of 9181838291920 in words is "nine trillion, one hundred eighty-one billion, eight hundred thirty-eight million, two hundred ninety-one thousand, nine hundred twenty".