61778236379 has 2 divisors, whose sum is σ = 61778236380. Its totient is φ = 61778236378.

The previous prime is 61778236349. The next prime is 61778236511. The reversal of 61778236379 is 97363287716.

61778236379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61778236379 - 2⁸ = 61778236123 is a prime.

It is not a weakly prime, because it can be changed into another prime (61778236349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30889118189 + 30889118190.

It is an arithmetic number, because the mean of its divisors is an integer number (30889118190).

Almost surely, 2^61778236379 is an apocalyptic number.

61778236379 is a deficient number, since it is larger than the sum of its proper divisors (1).

61778236379 is an equidigital number, since it uses as much as digits as its factorization.

61778236379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16003008, while the sum is 59.

The spelling of 61778236379 in words is "sixty-one billion, seven hundred seventy-eight million, two hundred thirty-six thousand, three hundred seventy-nine".