61666006 has 16 divisors (see below), whose sum is σ = 98778240. Its totient is φ = 28808640.

The previous prime is 61665991. The next prime is 61666019. The reversal of 61666006 is 60066616.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15351 + ... + 18946.

It is an arithmetic number, because the mean of its divisors is an integer number (6173640).

Almost surely, 2^61666006 is an apocalyptic number.

61666006 is a deficient number, since it is larger than the sum of its proper divisors (37112234).

61666006 is a wasteful number, since it uses less digits than its factorization.

61666006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34359.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 61666006 is about 7852.7705938732. The cubic root of 61666006 is about 395.0771755415.

The spelling of 61666006 in words is "sixty-one million, six hundred sixty-six thousand, six".