61566611 has 2 divisors, whose sum is σ = 61566612. Its totient is φ = 61566610.

The previous prime is 61566601. The next prime is 61566613. The reversal of 61566611 is 11666516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61566611 - 2¹⁰ = 61565587 is a prime.

Together with 61566613, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3649460 and since 61566611 and 3649460 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61566613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783305 + 30783306.

It is an arithmetic number, because the mean of its divisors is an integer number (30783306).

Almost surely, 2^61566611 is an apocalyptic number.

61566611 is a deficient number, since it is larger than the sum of its proper divisors (1).

61566611 is an equidigital number, since it uses as much as digits as its factorization.

61566611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 61566611 is about 7846.4393835676. The cubic root of 61566611 is about 394.8647958992.

The spelling of 61566611 in words is "sixty-one million, five hundred sixty-six thousand, six hundred eleven".