6661504671 has 16 divisors (see below), whose sum is σ = 9436867200. Its totient is φ = 4167942048.

The previous prime is 6661504667. The next prime is 6661504673. The reversal of 6661504671 is 1764051666.

It is a happy number.

It is not a de Polignac number, because 6661504671 - 2² = 6661504667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661504673) 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, 540016 + ... + 552213.

It is an arithmetic number, because the mean of its divisors is an integer number (589804200).

Almost surely, 2^6661504671 is an apocalyptic number.

6661504671 is a deficient number, since it is larger than the sum of its proper divisors (2775362529).

6661504671 is a wasteful number, since it uses less digits than its factorization.

6661504671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092358.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 6661504671 is about 81618.0413327838. The cubic root of 6661504671 is about 1881.5861699426.

The spelling of 6661504671 in words is "six billion, six hundred sixty-one million, five hundred four thousand, six hundred seventy-one".