61966261 has 4 divisors (see below), whose sum is σ = 70818592. Its totient is φ = 53113932.

The previous prime is 61966259. The next prime is 61966273. The reversal of 61966261 is 16266916.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61966261 - 2¹ = 61966259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61966261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61966361) 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, 4426155 + ... + 4426168.

It is an arithmetic number, because the mean of its divisors is an integer number (17704648).

Almost surely, 2^61966261 is an apocalyptic number.

It is an amenable number.

61966261 is a deficient number, since it is larger than the sum of its proper divisors (8852331).

61966261 is an equidigital number, since it uses as much as digits as its factorization.

61966261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8852330.

The product of its digits is 23328, while the sum is 37.

The square root of 61966261 is about 7871.8651538247. The cubic root of 61966261 is about 395.7173547666.

The spelling of 61966261 in words is "sixty-one million, nine hundred sixty-six thousand, two hundred sixty-one".