61566977 has 2 divisors, whose sum is σ = 61566978. Its totient is φ = 61566976.

The previous prime is 61566943. The next prime is 61566997. The reversal of 61566977 is 77966516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41460721 + 20106256 = 6439^2 + 4484^2 .

It is a cyclic number.

It is not a de Polignac number, because 61566977 - 2¹⁰ = 61565953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61566937) 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, 30783488 + 30783489.

It is an arithmetic number, because the mean of its divisors is an integer number (30783489).

Almost surely, 2^61566977 is an apocalyptic number.

It is an amenable number.

61566977 is a deficient number, since it is larger than the sum of its proper divisors (1).

61566977 is an equidigital number, since it uses as much as digits as its factorization.

61566977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 47.

The square root of 61566977 is about 7846.4627062135. The cubic root of 61566977 is about 394.8655783591.

The spelling of 61566977 in words is "sixty-one million, five hundred sixty-six thousand, nine hundred seventy-seven".