18705121492 has 24 divisors (see below), whose sum is σ = 32916723840. Its totient is φ = 9300455040.

The previous prime is 18705121483. The next prime is 18705121499. The reversal of 18705121492 is 29412150781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705121499) 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, 679623 + ... + 706609.

It is an arithmetic number, because the mean of its divisors is an integer number (1371530160).

Almost surely, 2^18705121492 is an apocalyptic number.

It is an amenable number.

18705121492 is a deficient number, since it is larger than the sum of its proper divisors (14211602348).

18705121492 is a wasteful number, since it uses less digits than its factorization.

18705121492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27951 (or 27949 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 18705121492 in words is "eighteen billion, seven hundred five million, one hundred twenty-one thousand, four hundred ninety-two".