18959000649 has 4 divisors (see below), whose sum is σ = 25278667536. Its totient is φ = 12639333764.

The previous prime is 18959000639. The next prime is 18959000659. The reversal of 18959000649 is 94600095981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18959000639) and next prime (18959000659).

It is a cyclic number.

It is not a de Polignac number, because 18959000649 - 2⁷ = 18959000521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18959000639) 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, 3159833439 + ... + 3159833444.

It is an arithmetic number, because the mean of its divisors is an integer number (6319666884).

Almost surely, 2^18959000649 is an apocalyptic number.

It is an amenable number.

18959000649 is a deficient number, since it is larger than the sum of its proper divisors (6319666887).

18959000649 is an equidigital number, since it uses as much as digits as its factorization.

18959000649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319666886.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 18959000649 in words is "eighteen billion, nine hundred fifty-nine million, six hundred forty-nine", and thus it is an aban number.