1854413478779 has 2 divisors, whose sum is σ = 1854413478780. Its totient is φ = 1854413478778.

The previous prime is 1854413478691. The next prime is 1854413478859. The reversal of 1854413478779 is 9778743144581.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9778743144581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1854413478779 - 2²⁸ = 1854145043323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1854413478079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927206739389 + 927206739390.

It is an arithmetic number, because the mean of its divisors is an integer number (927206739390).

Almost surely, 2^{1854413478779} is an apocalyptic number.

1854413478779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1854413478779 is an equidigital number, since it uses as much as digits as its factorization.

1854413478779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189665280, while the sum is 68.

The spelling of 1854413478779 in words is "one trillion, eight hundred fifty-four billion, four hundred thirteen million, four hundred seventy-eight thousand, seven hundred seventy-nine".