61661967 has 4 divisors (see below), whose sum is σ = 82215960. Its totient is φ = 41107976.

The previous prime is 61661927. The next prime is 61661969. The reversal of 61661967 is 76916616.

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 61661967 - 2¹⁰ = 61660943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661969) 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, 10276992 + ... + 10276997.

It is an arithmetic number, because the mean of its divisors is an integer number (20553990).

Almost surely, 2^61661967 is an apocalyptic number.

61661967 is a deficient number, since it is larger than the sum of its proper divisors (20553993).

61661967 is a wasteful number, since it uses less digits than its factorization.

61661967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20553992.

The product of its digits is 81648, while the sum is 42.

The square root of 61661967 is about 7852.5134192818. The cubic root of 61661967 is about 395.0685497651.

The spelling of 61661967 in words is "sixty-one million, six hundred sixty-one thousand, nine hundred sixty-seven".