17806890645 has 24 divisors (see below), whose sum is σ = 30899378016. Its totient is φ = 9486515808.

The previous prime is 17806890589. The next prime is 17806890671. The reversal of 17806890645 is 54609860871.

It is not a de Polignac number, because 17806890645 - 2¹⁵ = 17806857877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17806890591 and 17806890600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177327 + ... + 258956.

It is an arithmetic number, because the mean of its divisors is an integer number (1287474084).

Almost surely, 2^17806890645 is an apocalyptic number.

17806890645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17806890645 is a deficient number, since it is larger than the sum of its proper divisors (13092487371).

17806890645 is a wasteful number, since it uses less digits than its factorization.

17806890645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437201 (or 437198 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 17806890645 in words is "seventeen billion, eight hundred six million, eight hundred ninety thousand, six hundred forty-five".