18687253051 has 4 divisors (see below), whose sum is σ = 18693043600. Its totient is φ = 18681462504.

The previous prime is 18687253033. The next prime is 18687253087. The reversal of 18687253051 is 15035278681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18687253051 - 2²¹ = 18685155899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18687252992 and 18687253010.

It is not an unprimeable number, because it can be changed into a prime (18687253951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2890431 + ... + 2896888.

It is an arithmetic number, because the mean of its divisors is an integer number (4673260900).

Almost surely, 2^18687253051 is an apocalyptic number.

18687253051 is a deficient number, since it is larger than the sum of its proper divisors (5790549).

18687253051 is an equidigital number, since it uses as much as digits as its factorization.

18687253051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790548.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 18687253051 in words is "eighteen billion, six hundred eighty-seven million, two hundred fifty-three thousand, fifty-one".