61664253 has 32 divisors (see below), whose sum is σ = 104739840. Its totient is φ = 31415040.

The previous prime is 61664231. The next prime is 61664257. The reversal of 61664253 is 35246616.

It is not a de Polignac number, because 61664253 - 2⁵ = 61664221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61664257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2238 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (3273120).

Almost surely, 2^61664253 is an apocalyptic number.

It is an amenable number.

61664253 is a deficient number, since it is larger than the sum of its proper divisors (43075587).

61664253 is a wasteful number, since it uses less digits than its factorization.

61664253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9137.

The product of its digits is 25920, while the sum is 33.

The square root of 61664253 is about 7852.6589764232. The cubic root of 61664253 is about 395.0734318428.

The spelling of 61664253 in words is "sixty-one million, six hundred sixty-four thousand, two hundred fifty-three".