61566667 has 4 divisors (see below), whose sum is σ = 62410120. Its totient is φ = 60723216.

The previous prime is 61566649. The next prime is 61566683. The reversal of 61566667 is 76666516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61566667 - 2⁷ = 61566539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61569667) 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 in 3 ways as a sum of consecutive naturals, for example, 421617 + ... + 421762.

It is an arithmetic number, because the mean of its divisors is an integer number (15602530).

Almost surely, 2^61566667 is an apocalyptic number.

61566667 is a deficient number, since it is larger than the sum of its proper divisors (843453).

61566667 is an equidigital number, since it uses as much as digits as its factorization.

61566667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843452.

The product of its digits is 272160, while the sum is 43.

The square root of 61566667 is about 7846.4429520643. The cubic root of 61566667 is about 394.8649156200.

The spelling of 61566667 in words is "sixty-one million, five hundred sixty-six thousand, six hundred sixty-seven".