61866811 has 2 divisors, whose sum is σ = 61866812. Its totient is φ = 61866810.

The previous prime is 61866781. The next prime is 61866817. The reversal of 61866811 is 11866816.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61866811 - 2⁷ = 61866683 is a prime.

It is not a weakly prime, because it can be changed into another prime (61866817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933405 + 30933406.

It is an arithmetic number, because the mean of its divisors is an integer number (30933406).

Almost surely, 2^61866811 is an apocalyptic number.

61866811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61866811 is an equidigital number, since it uses as much as digits as its factorization.

61866811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 37.

The square root of 61866811 is about 7865.5458170428. The cubic root of 61866811 is about 395.5055450803.

The spelling of 61866811 in words is "sixty-one million, eight hundred sixty-six thousand, eight hundred eleven".