18625209949 has 4 divisors (see below), whose sum is σ = 18646303936. Its totient is φ = 18604115964.

The previous prime is 18625209937. The next prime is 18625209959. The reversal of 18625209949 is 94990252681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18625209949 - 2⁵ = 18625209917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18625209949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18625209959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10545669 + ... + 10547434.

It is an arithmetic number, because the mean of its divisors is an integer number (4661575984).

Almost surely, 2^18625209949 is an apocalyptic number.

It is an amenable number.

18625209949 is a deficient number, since it is larger than the sum of its proper divisors (21093987).

18625209949 is an equidigital number, since it uses as much as digits as its factorization.

18625209949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21093986.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 18625209949 in words is "eighteen billion, six hundred twenty-five million, two hundred nine thousand, nine hundred forty-nine".