18715449065 has 32 divisors (see below), whose sum is σ = 23791891200. Its totient is φ = 14093844480.

The previous prime is 18715449061. The next prime is 18715449097. The reversal of 18715449065 is 56094451781.

It is not a de Polignac number, because 18715449065 - 2² = 18715449061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18715449061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17605724 + ... + 17606786.

It is an arithmetic number, because the mean of its divisors is an integer number (743496600).

Almost surely, 2^18715449065 is an apocalyptic number.

It is an amenable number.

18715449065 is a deficient number, since it is larger than the sum of its proper divisors (5076442135).

18715449065 is a wasteful number, since it uses less digits than its factorization.

18715449065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 18715449065 in words is "eighteen billion, seven hundred fifteen million, four hundred forty-nine thousand, sixty-five".