78384046877 has 2 divisors, whose sum is σ = 78384046878. Its totient is φ = 78384046876.

The previous prime is 78384046781. The next prime is 78384046919. The reversal of 78384046877 is 77864048387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76252747321 + 2131299556 = 276139^2 + 46166^2 .

It is a cyclic number.

It is not a de Polignac number, because 78384046877 - 2²⁶ = 78316938013 is a prime.

It is a super-2 number, since 2×78384046877² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78384046177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39192023438 + 39192023439.

It is an arithmetic number, because the mean of its divisors is an integer number (39192023439).

Almost surely, 2^78384046877 is an apocalyptic number.

It is an amenable number.

78384046877 is a deficient number, since it is larger than the sum of its proper divisors (1).

78384046877 is an equidigital number, since it uses as much as digits as its factorization.

78384046877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50577408, while the sum is 62.

The spelling of 78384046877 in words is "seventy-eight billion, three hundred eighty-four million, forty-six thousand, eight hundred seventy-seven".