61966861 has 8 divisors (see below), whose sum is σ = 69781248. Its totient is φ = 54516000.

The previous prime is 61966859. The next prime is 61966871. The reversal of 61966861 is 16866916.

It is a happy number.

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

It is not a de Polignac number, because 61966861 - 2¹ = 61966859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61966831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90520 + ... + 91201.

It is an arithmetic number, because the mean of its divisors is an integer number (8722656).

Almost surely, 2^61966861 is an apocalyptic number.

It is an amenable number.

61966861 is a deficient number, since it is larger than the sum of its proper divisors (7814387).

61966861 is a wasteful number, since it uses less digits than its factorization.

61966861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181763.

The product of its digits is 93312, while the sum is 43.

The square root of 61966861 is about 7871.9032641414. The cubic root of 61966861 is about 395.7186319651.

The spelling of 61966861 in words is "sixty-one million, nine hundred sixty-six thousand, eight hundred sixty-one".