18906147901 has 4 divisors (see below), whose sum is σ = 18953295804. Its totient is φ = 18859000000.

The previous prime is 18906147893. The next prime is 18906147907. The reversal of 18906147901 is 10974160981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12133022500 + 6773125401 = 110150^2 + 82299^2 .

It is a cyclic number.

It is not a de Polignac number, because 18906147901 - 2³ = 18906147893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18906147907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23573350 + ... + 23574151.

It is an arithmetic number, because the mean of its divisors is an integer number (4738323951).

Almost surely, 2^18906147901 is an apocalyptic number.

It is an amenable number.

18906147901 is a deficient number, since it is larger than the sum of its proper divisors (47147903).

18906147901 is an equidigital number, since it uses as much as digits as its factorization.

18906147901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47147902.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 18906147901 in words is "eighteen billion, nine hundred six million, one hundred forty-seven thousand, nine hundred one".