6691880458 has 16 divisors (see below), whose sum is σ = 10313700840. Its totient is φ = 3254060736.

The previous prime is 6691880449. The next prime is 6691880479. The reversal of 6691880458 is 8540881966.

It can be written as a sum of positive squares in 4 ways, for example, as 4115607409 + 2576273049 = 64153^2 + 50757^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6691880399 and 6691880408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157860 + ... + 195712.

Almost surely, 2^6691880458 is an apocalyptic number.

6691880458 is a deficient number, since it is larger than the sum of its proper divisors (3621820382).

6691880458 is a wasteful number, since it uses less digits than its factorization.

6691880458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40281.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The square root of 6691880458 is about 81803.9146862789. The cubic root of 6691880458 is about 1884.4417813893.

The spelling of 6691880458 in words is "six billion, six hundred ninety-one million, eight hundred eighty thousand, four hundred fifty-eight".