18640925519 has 8 divisors (see below), whose sum is σ = 18831007440. Its totient is φ = 18450952000.

The previous prime is 18640925491. The next prime is 18640925533. The reversal of 18640925519 is 91552904681.

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 18640925519 - 2¹² = 18640921423 is a prime.

It is a super-2 number, since 2×18640925519² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640925419) 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, 344339 + ... + 394779.

It is an arithmetic number, because the mean of its divisors is an integer number (2353875930).

Almost surely, 2^18640925519 is an apocalyptic number.

18640925519 is a deficient number, since it is larger than the sum of its proper divisors (190081921).

18640925519 is a wasteful number, since it uses less digits than its factorization.

18640925519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54201.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 18640925519 in words is "eighteen billion, six hundred forty million, nine hundred twenty-five thousand, five hundred nineteen".