1985787700423 has 2 divisors, whose sum is σ = 1985787700424. Its totient is φ = 1985787700422.

The previous prime is 1985787700381. The next prime is 1985787700517. The reversal of 1985787700423 is 3240077875891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985787700423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985782700423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992893850211 + 992893850212.

It is an arithmetic number, because the mean of its divisors is an integer number (992893850212).

Almost surely, 2^{1985787700423} is an apocalyptic number.

1985787700423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985787700423 is an equidigital number, since it uses as much as digits as its factorization.

1985787700423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23708160, while the sum is 61.

The spelling of 1985787700423 in words is "one trillion, nine hundred eighty-five billion, seven hundred eighty-seven million, seven hundred thousand, four hundred twenty-three".