18951664553 has 8 divisors (see below), whose sum is σ = 18997716672. Its totient is φ = 18905665456.

The previous prime is 18951664541. The next prime is 18951664579. The reversal of 18951664553 is 35546615981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18951664553 - 2²⁴ = 18934887337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18951664495 and 18951664504.

It is not an unprimeable number, because it can be changed into a prime (18951663553) 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 7 ways as a sum of consecutive naturals, for example, 755651 + ... + 780327.

It is an arithmetic number, because the mean of its divisors is an integer number (2374714584).

Almost surely, 2^18951664553 is an apocalyptic number.

It is an amenable number.

18951664553 is a deficient number, since it is larger than the sum of its proper divisors (46052119).

18951664553 is a wasteful number, since it uses less digits than its factorization.

18951664553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26511.

The product of its digits is 3888000, while the sum is 53.

The spelling of 18951664553 in words is "eighteen billion, nine hundred fifty-one million, six hundred sixty-four thousand, five hundred fifty-three".