1858688028749 has 2 divisors, whose sum is σ = 1858688028750. Its totient is φ = 1858688028748.

The previous prime is 1858688028697. The next prime is 1858688028751. The reversal of 1858688028749 is 9478208868581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1840349994025 + 18338034724 = 1356595^2 + 135418^2 .

It is an emirp because it is prime and its reverse (9478208868581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1858688028749 - 2¹⁶ = 1858687963213 is a prime.

Together with 1858688028751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1858688028779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 929344014374 + 929344014375.

It is an arithmetic number, because the mean of its divisors is an integer number (929344014375).

Almost surely, 2^{1858688028749} is an apocalyptic number.

It is an amenable number.

1858688028749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1858688028749 is an equidigital number, since it uses as much as digits as its factorization.

1858688028749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 495452160, while the sum is 74.

The spelling of 1858688028749 in words is "one trillion, eight hundred fifty-eight billion, six hundred eighty-eight million, twenty-eight thousand, seven hundred forty-nine".