61520666 has 8 divisors (see below), whose sum is σ = 92367540. Its totient is φ = 30731488.

The previous prime is 61520663. The next prime is 61520707. The reversal of 61520666 is 66602516.

It can be written as a sum of positive squares in 2 ways, for example, as 60762025 + 758641 = 7795^2 + 871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61520663) 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, 11651 + ... + 16086.

Almost surely, 2^61520666 is an apocalyptic number.

61520666 is a deficient number, since it is larger than the sum of its proper divisors (30846874).

61520666 is a wasteful number, since it uses less digits than its factorization.

61520666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28848.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 61520666 is about 7843.5110760424. The cubic root of 61520666 is about 394.7665468777.

The spelling of 61520666 in words is "sixty-one million, five hundred twenty thousand, six hundred sixty-six".