61666045 has 16 divisors (see below), whose sum is σ = 84751488. Its totient is φ = 42194880.

The previous prime is 61666019. The next prime is 61666051. The reversal of 61666045 is 54066616.

It is not a de Polignac number, because 61666045 - 2⁷ = 61665917 is a prime.

It is a super-2 number, since 2×61666045² = 7605402211884050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61666045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17535 + ... + 20755.

It is an arithmetic number, because the mean of its divisors is an integer number (5296968).

Almost surely, 2^61666045 is an apocalyptic number.

It is an amenable number.

61666045 is a deficient number, since it is larger than the sum of its proper divisors (23085443).

61666045 is a wasteful number, since it uses less digits than its factorization.

61666045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 61666045 is about 7852.7730770728. The cubic root of 61666045 is about 395.0772588289.

The spelling of 61666045 in words is "sixty-one million, six hundred sixty-six thousand, forty-five".