18640925645 has 8 divisors (see below), whose sum is σ = 22735817880. Its totient is φ = 14668269120.

The previous prime is 18640925623. The next prime is 18640925717. The reversal of 18640925645 is 54652904681.

It can be written as a sum of positive squares in 4 ways, for example, as 1510565956 + 17130359689 = 38866^2 + 130883^2 .

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

It is not a de Polignac number, because 18640925645 - 2¹⁶ = 18640860109 is a prime.

It is a super-3 number, since 3×18640925645³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18640925593 and 18640925602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30558590 + ... + 30559199.

It is an arithmetic number, because the mean of its divisors is an integer number (2841977235).

Almost surely, 2^18640925645 is an apocalyptic number.

It is an amenable number.

18640925645 is a deficient number, since it is larger than the sum of its proper divisors (4094892235).

18640925645 is an equidigital number, since it uses as much as digits as its factorization.

18640925645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61117855.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 18640925645 in words is "eighteen billion, six hundred forty million, nine hundred twenty-five thousand, six hundred forty-five".