61780711 has 2 divisors, whose sum is σ = 61780712. Its totient is φ = 61780710.

The previous prime is 61780699. The next prime is 61780753. The reversal of 61780711 is 11708716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61780711 - 2⁵ = 61780679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61780781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30890355 + 30890356.

It is an arithmetic number, because the mean of its divisors is an integer number (30890356).

Almost surely, 2^61780711 is an apocalyptic number.

61780711 is a deficient number, since it is larger than the sum of its proper divisors (1).

61780711 is an equidigital number, since it uses as much as digits as its factorization.

61780711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 61780711 is about 7860.0706739825. The cubic root of 61780711 is about 395.3219849651.

The spelling of 61780711 in words is "sixty-one million, seven hundred eighty thousand, seven hundred eleven".