61142404979 has 2 divisors, whose sum is σ = 61142404980. Its totient is φ = 61142404978.

The previous prime is 61142404957. The next prime is 61142405029. The reversal of 61142404979 is 97940424116.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61142404979 - 2⁸ = 61142404723 is a prime.

It is not a weakly prime, because it can be changed into another prime (61142404949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30571202489 + 30571202490.

It is an arithmetic number, because the mean of its divisors is an integer number (30571202490).

Almost surely, 2^61142404979 is an apocalyptic number.

61142404979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61142404979 is an equidigital number, since it uses as much as digits as its factorization.

61142404979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 61142404979 in words is "sixty-one billion, one hundred forty-two million, four hundred four thousand, nine hundred seventy-nine".