1662662661 has 16 divisors (see below), whose sum is σ = 2434441728. Its totient is φ = 1000998000.

The previous prime is 1662662653. The next prime is 1662662671.

It is a happy number.

1662662661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1662662661 - 2³ = 1662662653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662662641) 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, 161851 + ... + 171816.

It is an arithmetic number, because the mean of its divisors is an integer number (152152608).

Almost surely, 2^1662662661 is an apocalyptic number.

1662662661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1662662661 is a deficient number, since it is larger than the sum of its proper divisors (771779067).

1662662661 is a wasteful number, since it uses less digits than its factorization.

1662662661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333832.

The product of its digits is 186624, while the sum is 42.

The square root of 1662662661 is about 40775.7607041242. The cubic root of 1662662661 is about 1184.6808854261.

The spelling of 1662662661 in words is "one billion, six hundred sixty-two million, six hundred sixty-two thousand, six hundred sixty-one".