18649371076649 has 4 divisors (see below), whose sum is σ = 18757170909636. Its totient is φ = 18541571243664.

The previous prime is 18649371076631. The next prime is 18649371076657. The reversal of 18649371076649 is 94667017394681.

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 17304501777424 + 1344869299225 = 4159868^2 + 1159685^2 .

It is a cyclic number.

It is not a de Polignac number, because 18649371076649 - 2³² = 18645076109353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18649371076549) 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, 53899916234 + ... + 53899916579.

It is an arithmetic number, because the mean of its divisors is an integer number (4689292727409).

Almost surely, 2^{18649371076649} is an apocalyptic number.

It is an amenable number.

18649371076649 is a deficient number, since it is larger than the sum of its proper divisors (107799832987).

18649371076649 is a wasteful number, since it uses less digits than its factorization.

18649371076649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107799832986.

The product of its (nonzero) digits is 329204736, while the sum is 71.

The spelling of 18649371076649 in words is "eighteen trillion, six hundred forty-nine billion, three hundred seventy-one million, seventy-six thousand, six hundred forty-nine".