61660026 has 24 divisors (see below), whose sum is σ = 134296500. Its totient is φ = 20445696.

The previous prime is 61660007. The next prime is 61660031. The reversal of 61660026 is 62006616.

It can be written as a sum of positive squares in 2 ways, for example, as 52056225 + 9603801 = 7215^2 + 3099^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5401 + ... + 12348.

Almost surely, 2^61660026 is an apocalyptic number.

61660026 is an abundant number, since it is smaller than the sum of its proper divisors (72636474).

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

61660026 is a wasteful number, since it uses less digits than its factorization.

61660026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17950 (or 17947 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 61660026 is about 7852.3898273074. The cubic root of 61660026 is about 395.0644043891.

The spelling of 61660026 in words is "sixty-one million, six hundred sixty thousand, twenty-six".