6691451977 has 32 divisors (see below), whose sum is σ = 8162631680. Its totient is φ = 5357975040.

The previous prime is 6691451971. The next prime is 6691451981. The reversal of 6691451977 is 7791541966.

6691451977 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6691451977 - 2²⁷ = 6557234249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6691451971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4269448 + ... + 4271014.

It is an arithmetic number, because the mean of its divisors is an integer number (255082240).

Almost surely, 2^6691451977 is an apocalyptic number.

It is an amenable number.

6691451977 is a deficient number, since it is larger than the sum of its proper divisors (1471179703).

6691451977 is a wasteful number, since it uses less digits than its factorization.

6691451977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021.

The product of its digits is 2857680, while the sum is 55.

The square root of 6691451977 is about 81801.2956926723. The cubic root of 6691451977 is about 1884.4015602716.

The spelling of 6691451977 in words is "six billion, six hundred ninety-one million, four hundred fifty-one thousand, nine hundred seventy-seven".