78121414379 has 2 divisors, whose sum is σ = 78121414380. Its totient is φ = 78121414378.

The previous prime is 78121414333. The next prime is 78121414411. The reversal of 78121414379 is 97341412187.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78121414379 - 2⁸ = 78121414123 is a prime.

It is a super-2 number, since 2×78121414379² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (78121414079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39060707189 + 39060707190.

It is an arithmetic number, because the mean of its divisors is an integer number (39060707190).

Almost surely, 2^78121414379 is an apocalyptic number.

78121414379 is a deficient number, since it is larger than the sum of its proper divisors (1).

78121414379 is an equidigital number, since it uses as much as digits as its factorization.

78121414379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The spelling of 78121414379 in words is "seventy-eight billion, one hundred twenty-one million, four hundred fourteen thousand, three hundred seventy-nine".