18621739137 has 8 divisors (see below), whose sum is σ = 24829641504. Its totient is φ = 12414164768.

The previous prime is 18621739099. The next prime is 18621739151. The reversal of 18621739137 is 73193712681.

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

It is a cyclic number.

It is not a de Polignac number, because 18621739137 - 2⁸ = 18621738881 is a prime.

It is a super-3 number, since 3×18621739137³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18621739177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125458 + ... + 230180.

It is an arithmetic number, because the mean of its divisors is an integer number (3103705188).

Almost surely, 2^18621739137 is an apocalyptic number.

It is an amenable number.

18621739137 is a deficient number, since it is larger than the sum of its proper divisors (6207902367).

18621739137 is a wasteful number, since it uses less digits than its factorization.

18621739137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163999.

The product of its digits is 381024, while the sum is 48.

The spelling of 18621739137 in words is "eighteen billion, six hundred twenty-one million, seven hundred thirty-nine thousand, one hundred thirty-seven".