1851075778157 has 2 divisors, whose sum is σ = 1851075778158. Its totient is φ = 1851075778156.

The previous prime is 1851075778127. The next prime is 1851075778171. The reversal of 1851075778157 is 7518775701581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1847911265641 + 3164512516 = 1359379^2 + 56254^2 .

It is an emirp because it is prime and its reverse (7518775701581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851075778157 - 2⁶ = 1851075778093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1851075778157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851075778117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925537889078 + 925537889079.

It is an arithmetic number, because the mean of its divisors is an integer number (925537889079).

Almost surely, 2^{1851075778157} is an apocalyptic number.

It is an amenable number.

1851075778157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851075778157 is an equidigital number, since it uses as much as digits as its factorization.

1851075778157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19208000, while the sum is 62.

The spelling of 1851075778157 in words is "one trillion, eight hundred fifty-one billion, seventy-five million, seven hundred seventy-eight thousand, one hundred fifty-seven".