4006641664 has 32 divisors (see below), whose sum is σ = 8013226590. Its totient is φ = 2003304448.

The previous prime is 4006641631. The next prime is 4006641703. The reversal of 4006641664 is 4661466004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2767601664 + 1239040000 = 52608^2 + 35200^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28369 + ... + 93904.

Almost surely, 2^4006641664 is an apocalyptic number.

It is an amenable number.

4006641664 is a deficient number, since it is larger than the sum of its proper divisors (4006584926).

4006641664 is an frugal number, since it uses more digits than its factorization.

4006641664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122303 (or 122275 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 4006641664 is about 63298.0383898269. The cubic root of 4006641664 is about 1588.2791481807.

The spelling of 4006641664 in words is "four billion, six million, six hundred forty-one thousand, six hundred sixty-four".