61666010 has 48 divisors (see below), whose sum is σ = 129854664. Its totient is φ = 21022848.

The previous prime is 61665991. The next prime is 61666019. The reversal of 61666010 is 1066616.

It can be written as a sum of positive squares in 4 ways, for example, as 39075001 + 22591009 = 6251^2 + 4753^2 .

It is not an unprimeable number, because it can be changed into a prime (61666019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155132 + ... + 155528.

Almost surely, 2^61666010 is an apocalyptic number.

61666010 is an abundant number, since it is smaller than the sum of its proper divisors (68188654).

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

61666010 is a wasteful number, since it uses less digits than its factorization.

61666010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61666010 is about 7852.7708485604. The cubic root of 61666010 is about 395.0771840838.

The spelling of 61666010 in words is "sixty-one million, six hundred sixty-six thousand, ten".