18907514729 has 4 divisors (see below), whose sum is σ = 18907919700. Its totient is φ = 18907109760.

The previous prime is 18907514719. The next prime is 18907514741. The reversal of 18907514729 is 92741570981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92741570981 = 85243 ⋅1087967.

It can be written as a sum of positive squares in 2 ways, for example, as 13701170704 + 5206344025 = 117052^2 + 72155^2 .

It is a cyclic number.

It is not a de Polignac number, because 18907514729 - 2⁴ = 18907514713 is a prime.

It is a super-2 number, since 2×18907514729² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18907514719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121712 + ... + 229409.

It is an arithmetic number, because the mean of its divisors is an integer number (4726979925).

Almost surely, 2^18907514729 is an apocalyptic number.

It is an amenable number.

18907514729 is a deficient number, since it is larger than the sum of its proper divisors (404971).

18907514729 is an equidigital number, since it uses as much as digits as its factorization.

18907514729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404970.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 18907514729 in words is "eighteen billion, nine hundred seven million, five hundred fourteen thousand, seven hundred twenty-nine".