1856663979277 has 2 divisors, whose sum is σ = 1856663979278. Its totient is φ = 1856663979276.

The previous prime is 1856663979263. The next prime is 1856663979319. The reversal of 1856663979277 is 7729793666581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1812930295401 + 43733683876 = 1346451^2 + 209126^2 .

It is a cyclic number.

It is not a de Polignac number, because 1856663979277 - 2³⁵ = 1822304240909 is a prime.

It is a super-2 number, since 2×1856663979277² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1856663079277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 928331989638 + 928331989639.

It is an arithmetic number, because the mean of its divisors is an integer number (928331989639).

Almost surely, 2^{1856663979277} is an apocalyptic number.

It is an amenable number.

1856663979277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856663979277 is an equidigital number, since it uses as much as digits as its factorization.

1856663979277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440270720, while the sum is 76.

The spelling of 1856663979277 in words is "one trillion, eight hundred fifty-six billion, six hundred sixty-three million, nine hundred seventy-nine thousand, two hundred seventy-seven".