18645952919 has 8 divisors (see below), whose sum is σ = 20343810960. Its totient is φ = 16948556800.

The previous prime is 18645952909. The next prime is 18645952957. The reversal of 18645952919 is 91925954681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18645952919 is a prime.

It is a super-2 number, since 2×18645952919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645952909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28202 + ... + 195159.

It is an arithmetic number, because the mean of its divisors is an integer number (2542976370).

Almost surely, 2^18645952919 is an apocalyptic number.

18645952919 is a deficient number, since it is larger than the sum of its proper divisors (1697858041).

18645952919 is a wasteful number, since it uses less digits than its factorization.

18645952919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230961.

The product of its digits is 6998400, while the sum is 59.

The spelling of 18645952919 in words is "eighteen billion, six hundred forty-five million, nine hundred fifty-two thousand, nine hundred nineteen".