61644167 has 4 divisors (see below), whose sum is σ = 66386040. Its totient is φ = 56902296.

The previous prime is 61644157. The next prime is 61644181. The reversal of 61644167 is 76144616.

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 61644167 - 2¹² = 61640071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61644127) 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, 2370917 + ... + 2370942.

It is an arithmetic number, because the mean of its divisors is an integer number (16596510).

Almost surely, 2^61644167 is an apocalyptic number.

61644167 is a deficient number, since it is larger than the sum of its proper divisors (4741873).

61644167 is a wasteful number, since it uses less digits than its factorization.

61644167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741872.

The product of its digits is 24192, while the sum is 35.

The square root of 61644167 is about 7851.3799424050. The cubic root of 61644167 is about 395.0305312084.

The spelling of 61644167 in words is "sixty-one million, six hundred forty-four thousand, one hundred sixty-seven".