61408804939 has 2 divisors, whose sum is σ = 61408804940. Its totient is φ = 61408804938.

The previous prime is 61408804823. The next prime is 61408804967. The reversal of 61408804939 is 93940880416.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61408804939 - 2⁷ = 61408804811 is a prime.

It is not a weakly prime, because it can be changed into another prime (61408804969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30704402469 + 30704402470.

It is an arithmetic number, because the mean of its divisors is an integer number (30704402470).

Almost surely, 2^61408804939 is an apocalyptic number.

61408804939 is a deficient number, since it is larger than the sum of its proper divisors (1).

61408804939 is an equidigital number, since it uses as much as digits as its factorization.

61408804939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 61408804939 in words is "sixty-one billion, four hundred eight million, eight hundred four thousand, nine hundred thirty-nine".