6601726491 has 12 divisors (see below), whose sum is σ = 9289965672. Its totient is φ = 4169510784.

The previous prime is 6601726451. The next prime is 6601726507. The reversal of 6601726491 is 1946271066.

It is not a de Polignac number, because 6601726491 - 2¹⁹ = 6601202203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6601726451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3046806 + ... + 3048971.

It is an arithmetic number, because the mean of its divisors is an integer number (774163806).

Almost surely, 2^6601726491 is an apocalyptic number.

6601726491 is a deficient number, since it is larger than the sum of its proper divisors (2688239181).

6601726491 is a wasteful number, since it uses less digits than its factorization.

6601726491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095818 (or 6095799 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 6601726491 is about 81251.0091691174. The cubic root of 6601726491 is about 1875.9410023643.

The spelling of 6601726491 in words is "six billion, six hundred one million, seven hundred twenty-six thousand, four hundred ninety-one".