61966656 has 42 divisors (see below), whose sum is σ = 177617882. Its totient is φ = 20655360.

The previous prime is 61966651. The next prime is 61966673. The reversal of 61966656 is 65666916.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 6969600 = 7416^2 + 2640^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61966651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53215 + ... + 54366.

Almost surely, 2^61966656 is an apocalyptic number.

It is an amenable number.

61966656 is an abundant number, since it is smaller than the sum of its proper divisors (115651226).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61966656 is a wasteful number, since it uses less digits than its factorization.

61966656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107599 (or 107586 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 61966656 is about 7871.8902431373. The cubic root of 61966656 is about 395.7181955899.

The spelling of 61966656 in words is "sixty-one million, nine hundred sixty-six thousand, six hundred fifty-six".