18987936552451 has 2 divisors, whose sum is σ = 18987936552452. Its totient is φ = 18987936552450.

The previous prime is 18987936552383. The next prime is 18987936552503. The reversal of 18987936552451 is 15425563978981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18987936552451 - 2¹¹ = 18987936550403 is a prime.

It is not a weakly prime, because it can be changed into another prime (18987936552551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493968276225 + 9493968276226.

It is an arithmetic number, because the mean of its divisors is an integer number (9493968276226).

Almost surely, 2^{18987936552451} is an apocalyptic number.

18987936552451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18987936552451 is an equidigital number, since it uses as much as digits as its factorization.

18987936552451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184000, while the sum is 73.

The spelling of 18987936552451 in words is "eighteen trillion, nine hundred eighty-seven billion, nine hundred thirty-six million, five hundred fifty-two thousand, four hundred fifty-one".