18507068477 has 4 divisors (see below), whose sum is σ = 18507384156. Its totient is φ = 18506752800.

The previous prime is 18507068453. The next prime is 18507068491. The reversal of 18507068477 is 77486070581.

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 14937483961 + 3569584516 = 122219^2 + 59746^2 .

It is a cyclic number.

It is not a de Polignac number, because 18507068477 - 2⁶ = 18507068413 is a prime.

It is a super-2 number, since 2×18507068477² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18507068407) 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, 41138 + ... + 196739.

It is an arithmetic number, because the mean of its divisors is an integer number (4626846039).

Almost surely, 2^18507068477 is an apocalyptic number.

It is an amenable number.

18507068477 is a deficient number, since it is larger than the sum of its proper divisors (315679).

18507068477 is an equidigital number, since it uses as much as digits as its factorization.

18507068477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315678.

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 18507068477 in words is "eighteen billion, five hundred seven million, sixty-eight thousand, four hundred seventy-seven".