6666291697 has 24 divisors (see below), whose sum is σ = 7352213856. Its totient is φ = 6040210176.

The previous prime is 6666291691. The next prime is 6666291701. The reversal of 6666291697 is 7961926666.

It is a de Polignac number, because none of the positive numbers 2^k-6666291697 is a prime.

It is a super-2 number, since 2×6666291697² = 88878889978982279618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6666291691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3814978 + ... + 3816724.

It is an arithmetic number, because the mean of its divisors is an integer number (306342244).

Almost surely, 2^6666291697 is an apocalyptic number.

6666291697 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

6666291697 is a deficient number, since it is larger than the sum of its proper divisors (685922159).

6666291697 is a wasteful number, since it uses less digits than its factorization.

6666291697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2164 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 58.

The square root of 6666291697 is about 81647.3618496030. The cubic root of 6666291697 is about 1882.0367711039.

The spelling of 6666291697 in words is "six billion, six hundred sixty-six million, two hundred ninety-one thousand, six hundred ninety-seven".