187906474913 has 4 divisors (see below), whose sum is σ = 191091330480. Its totient is φ = 184721619348.

The previous prime is 187906474909. The next prime is 187906474927. The reversal of 187906474913 is 319474609781.

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 187906474913 - 2² = 187906474909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 3184855507 = 187906474913 / (1 + 8 + 7 + 9 + 0 + 6 + 4 + 7 + 4 + 9 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187906404913) 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, 1592427695 + ... + 1592427812.

It is an arithmetic number, because the mean of its divisors is an integer number (47772832620).

Almost surely, 2^187906474913 is an apocalyptic number.

It is an amenable number.

187906474913 is a deficient number, since it is larger than the sum of its proper divisors (3184855567).

187906474913 is an equidigital number, since it uses as much as digits as its factorization.

187906474913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184855566.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 187906474913 in words is "one hundred eighty-seven billion, nine hundred six million, four hundred seventy-four thousand, nine hundred thirteen".