18906690249 has 20 divisors (see below), whose sum is σ = 28247026500. Its totient is φ = 12602809440.

The previous prime is 18906690217. The next prime is 18906690251. The reversal of 18906690249 is 94209660981.

It can be written as a sum of positive squares in 2 ways, for example, as 3364580025 + 15542110224 = 58005^2 + 124668^2 .

It is not a de Polignac number, because 18906690249 - 2⁵ = 18906690217 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18906690195 and 18906690204.

It is not an unprimeable number, because it can be changed into a prime (18906690949) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1192627 + ... + 1208375.

It is an arithmetic number, because the mean of its divisors is an integer number (1412351325).

Almost surely, 2^18906690249 is an apocalyptic number.

It is an amenable number.

18906690249 is a deficient number, since it is larger than the sum of its proper divisors (9340336251).

18906690249 is a wasteful number, since it uses less digits than its factorization.

18906690249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30582 (or 30573 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 18906690249 in words is "eighteen billion, nine hundred six million, six hundred ninety thousand, two hundred forty-nine".