1779978336431 has 2 divisors, whose sum is σ = 1779978336432. Its totient is φ = 1779978336430.

The previous prime is 1779978336401. The next prime is 1779978336439. The reversal of 1779978336431 is 1346338799771.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1779978336431 is a prime.

It is a super-2 number, since 2×1779978336431² (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 (1779978336439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889989168215 + 889989168216.

It is an arithmetic number, because the mean of its divisors is an integer number (889989168216).

Almost surely, 2^{1779978336431} is an apocalyptic number.

1779978336431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779978336431 is an equidigital number, since it uses as much as digits as its factorization.

1779978336431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 68.

The spelling of 1779978336431 in words is "one trillion, seven hundred seventy-nine billion, nine hundred seventy-eight million, three hundred thirty-six thousand, four hundred thirty-one".