18958785137 has 4 divisors (see below), whose sum is σ = 18960001536. Its totient is φ = 18957568740.

The previous prime is 18958785133. The next prime is 18958785151. The reversal of 18958785137 is 73158785981.

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 18958785137 - 2² = 18958785133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18958785137.

It is not an unprimeable number, because it can be changed into a prime (18958785133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584513 + ... + 616094.

It is an arithmetic number, because the mean of its divisors is an integer number (4740000384).

Almost surely, 2^18958785137 is an apocalyptic number.

It is an amenable number.

18958785137 is a deficient number, since it is larger than the sum of its proper divisors (1216399).

18958785137 is a wasteful number, since it uses less digits than its factorization.

18958785137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216398.

The product of its digits is 16934400, while the sum is 62.

The spelling of 18958785137 in words is "eighteen billion, nine hundred fifty-eight million, seven hundred eighty-five thousand, one hundred thirty-seven".