6491597749 has 24 divisors (see below), whose sum is σ = 8292751872. Its totient is φ = 4970496960.

The previous prime is 6491597737. The next prime is 6491597753. The reversal of 6491597749 is 9477951946.

It is not a de Polignac number, because 6491597749 - 2⁷ = 6491597621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491597729) 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, 51834 + ... + 125179.

It is an arithmetic number, because the mean of its divisors is an integer number (345531328).

Almost surely, 2^6491597749 is an apocalyptic number.

It is an amenable number.

6491597749 is a deficient number, since it is larger than the sum of its proper divisors (1801154123).

6491597749 is a wasteful number, since it uses less digits than its factorization.

6491597749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177077 (or 177064 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 61.

The square root of 6491597749 is about 80570.4520838750. The cubic root of 6491597749 is about 1865.4510907548.

The spelling of 6491597749 in words is "six billion, four hundred ninety-one million, five hundred ninety-seven thousand, seven hundred forty-nine".