61866166 has 8 divisors (see below), whose sum is σ = 97683480. Its totient is φ = 29305008.

The previous prime is 61866163. The next prime is 61866169. The reversal of 61866166 is 66166816.

It is an interprime number because it is at equal distance from previous prime (61866163) and next prime (61866169).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61866163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813991 + ... + 814066.

It is an arithmetic number, because the mean of its divisors is an integer number (12210435).

Almost surely, 2^61866166 is an apocalyptic number.

61866166 is a deficient number, since it is larger than the sum of its proper divisors (35817314).

61866166 is a wasteful number, since it uses less digits than its factorization.

61866166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628078.

The product of its digits is 62208, while the sum is 40.

The square root of 61866166 is about 7865.5048153313. The cubic root of 61866166 is about 395.5041706117.

Subtracting from 61866166 its sum of digits (40), we obtain a triangular number (61866126 = T₁₁₁₂₃).

The spelling of 61866166 in words is "sixty-one million, eight hundred sixty-six thousand, one hundred sixty-six".