18640136735 has 16 divisors (see below), whose sum is σ = 24428252160. Its totient is φ = 13541675040.

The previous prime is 18640136731. The next prime is 18640136783. The reversal of 18640136735 is 53763104681.

It is not a de Polignac number, because 18640136735 - 2² = 18640136731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640136731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133847 + ... + 234936.

It is an arithmetic number, because the mean of its divisors is an integer number (1526765760).

Almost surely, 2^18640136735 is an apocalyptic number.

18640136735 is a deficient number, since it is larger than the sum of its proper divisors (5788115425).

18640136735 is a wasteful number, since it uses less digits than its factorization.

18640136735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369718.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 18640136735 in words is "eighteen billion, six hundred forty million, one hundred thirty-six thousand, seven hundred thirty-five".