1660041661 has 16 divisors (see below), whose sum is σ = 1758468096. Its totient is φ = 1564560000.

The previous prime is 1660041637. The next prime is 1660041679. The reversal of 1660041661 is 1661400661.

It is not a de Polignac number, because 1660041661 - 2¹⁵ = 1660008893 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660041611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1347916 + ... + 1349146.

It is an arithmetic number, because the mean of its divisors is an integer number (109904256).

Almost surely, 2^1660041661 is an apocalyptic number.

It is an amenable number.

1660041661 is a deficient number, since it is larger than the sum of its proper divisors (98426435).

1660041661 is a wasteful number, since it uses less digits than its factorization.

1660041661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1660041661 is about 40743.6088362334. The cubic root of 1660041661 is about 1184.0580528074.

The spelling of 1660041661 in words is "one billion, six hundred sixty million, forty-one thousand, six hundred sixty-one".