61662199 has 4 divisors (see below), whose sum is σ = 61834320. Its totient is φ = 61490080.

The previous prime is 61662187. The next prime is 61662203. The reversal of 61662199 is 99126616.

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 61662199 - 2¹⁹ = 61137911 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61662109) 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, 85522 + ... + 86239.

It is an arithmetic number, because the mean of its divisors is an integer number (15458580).

Almost surely, 2^61662199 is an apocalyptic number.

61662199 is a deficient number, since it is larger than the sum of its proper divisors (172121).

61662199 is a wasteful number, since it uses less digits than its factorization.

61662199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172120.

The product of its digits is 34992, while the sum is 40.

The square root of 61662199 is about 7852.5281916081. The cubic root of 61662199 is about 395.0690452395.

The spelling of 61662199 in words is "sixty-one million, six hundred sixty-two thousand, one hundred ninety-nine".