61664164 has 12 divisors (see below), whose sum is σ = 110544588. Its totient is φ = 30080000.

The previous prime is 61664131. The next prime is 61664167. The reversal of 61664164 is 46146616.

It can be written as a sum of positive squares in 2 ways, for example, as 17707264 + 43956900 = 4208^2 + 6630^2 .

It is not an unprimeable number, because it can be changed into a prime (61664167) 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, 187837 + ... + 188164.

It is an arithmetic number, because the mean of its divisors is an integer number (9212049).

Almost surely, 2^61664164 is an apocalyptic number.

It is an amenable number.

61664164 is a deficient number, since it is larger than the sum of its proper divisors (48880424).

61664164 is a wasteful number, since it uses less digits than its factorization.

61664164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376046 (or 376044 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 61664164 is about 7852.6533095509. The cubic root of 61664164 is about 395.0732417729.

It can be divided in two parts, 61 and 664164, that added together give a square (664225 = 815²).

The spelling of 61664164 in words is "sixty-one million, six hundred sixty-four thousand, one hundred sixty-four".