779970123749 has 2 divisors, whose sum is σ = 779970123750. Its totient is φ = 779970123748.

The previous prime is 779970123697. The next prime is 779970123769. The reversal of 779970123749 is 947321079977.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 517500390625 + 262469733124 = 719375^2 + 512318^2 .

It is a cyclic number.

It is not a de Polignac number, because 779970123749 - 2²⁴ = 779953346533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (779970123769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389985061874 + 389985061875.

It is an arithmetic number, because the mean of its divisors is an integer number (389985061875).

Almost surely, 2^779970123749 is an apocalyptic number.

It is an amenable number.

779970123749 is a deficient number, since it is larger than the sum of its proper divisors (1).

779970123749 is an equidigital number, since it uses as much as digits as its factorization.

779970123749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42007896, while the sum is 65.

The spelling of 779970123749 in words is "seven hundred seventy-nine billion, nine hundred seventy million, one hundred twenty-three thousand, seven hundred forty-nine".