18771901606313 has 2 divisors, whose sum is σ = 18771901606314. Its totient is φ = 18771901606312.

The previous prime is 18771901606291. The next prime is 18771901606321. The reversal of 18771901606313 is 31360610917781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16628028751504 + 2143872854809 = 4077748^2 + 1464197^2 .

It is a cyclic number.

It is not a de Polignac number, because 18771901606313 - 2¹⁴ = 18771901589929 is a prime.

It is not a weakly prime, because it can be changed into another prime (18771901606613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9385950803156 + 9385950803157.

It is an arithmetic number, because the mean of its divisors is an integer number (9385950803157).

Almost surely, 2^{18771901606313} is an apocalyptic number.

It is an amenable number.

18771901606313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18771901606313 is an equidigital number, since it uses as much as digits as its factorization.

18771901606313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 18771901606313 in words is "eighteen trillion, seven hundred seventy-one billion, nine hundred one million, six hundred six thousand, three hundred thirteen".