61566887 has 2 divisors, whose sum is σ = 61566888. Its totient is φ = 61566886.

The previous prime is 61566839. The next prime is 61566937. The reversal of 61566887 is 78866516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61566887 - 2¹⁶ = 61501351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61566487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783443 + 30783444.

It is an arithmetic number, because the mean of its divisors is an integer number (30783444).

Almost surely, 2^61566887 is an apocalyptic number.

61566887 is a deficient number, since it is larger than the sum of its proper divisors (1).

61566887 is an equidigital number, since it uses as much as digits as its factorization.

61566887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 61566887 is about 7846.4569711431. The cubic root of 61566887 is about 394.8653859512.

The spelling of 61566887 in words is "sixty-one million, five hundred sixty-six thousand, eight hundred eighty-seven".