77744138419 has 2 divisors, whose sum is σ = 77744138420. Its totient is φ = 77744138418.

The previous prime is 77744138401. The next prime is 77744138429. The reversal of 77744138419 is 91483144777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77744138419 - 2²³ = 77735749811 is a prime.

It is a super-2 number, since 2×77744138419² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77744138419.

It is not a weakly prime, because it can be changed into another prime (77744138429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38872069209 + 38872069210.

It is an arithmetic number, because the mean of its divisors is an integer number (38872069210).

Almost surely, 2^77744138419 is an apocalyptic number.

77744138419 is a deficient number, since it is larger than the sum of its proper divisors (1).

77744138419 is an equidigital number, since it uses as much as digits as its factorization.

77744138419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 55.

The spelling of 77744138419 in words is "seventy-seven billion, seven hundred forty-four million, one hundred thirty-eight thousand, four hundred nineteen".