18725846613 has 12 divisors (see below), whose sum is σ = 26522884320. Its totient is φ = 11749550272.

The previous prime is 18725846609. The next prime is 18725846617. The reversal of 18725846613 is 31664852781.

It is an interprime number because it is at equal distance from previous prime (18725846609) and next prime (18725846617).

It is not a de Polignac number, because 18725846613 - 2² = 18725846609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725846617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10798353 + ... + 10800086.

It is an arithmetic number, because the mean of its divisors is an integer number (2210240360).

Almost surely, 2^18725846613 is an apocalyptic number.

It is an amenable number.

18725846613 is a deficient number, since it is larger than the sum of its proper divisors (7797037707).

18725846613 is a wasteful number, since it uses less digits than its factorization.

18725846613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21598476 (or 21598459 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

It can be divided in two parts, 1872 and 5846613, that added together give a palindrome (5848485).

The spelling of 18725846613 in words is "eighteen billion, seven hundred twenty-five million, eight hundred forty-six thousand, six hundred thirteen".