6661657701 has 8 divisors (see below), whose sum is σ = 9869122560. Its totient is φ = 4441105116.

The previous prime is 6661657687. The next prime is 6661657703. The reversal of 6661657701 is 1077561666.

It is not a de Polignac number, because 6661657701 - 2¹¹ = 6661655653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661657703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123364005 + ... + 123364058.

It is an arithmetic number, because the mean of its divisors is an integer number (1233640320).

Almost surely, 2^6661657701 is an apocalyptic number.

It is an amenable number.

6661657701 is a deficient number, since it is larger than the sum of its proper divisors (3207464859).

6661657701 is a wasteful number, since it uses less digits than its factorization.

6661657701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246728072 (or 246728066 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 6661657701 is about 81618.9788039522. The cubic root of 6661657701 is about 1881.6005779450.

The spelling of 6661657701 in words is "six billion, six hundred sixty-one million, six hundred fifty-seven thousand, seven hundred one".