6491059638 has 16 divisors (see below), whose sum is σ = 14836707840. Its totient is φ = 1854588456.

The previous prime is 6491059633. The next prime is 6491059643. The reversal of 6491059638 is 8369501946.

It is an interprime number because it is at equal distance from previous prime (6491059633) and next prime (6491059643).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491059633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77274478 + ... + 77274561.

It is an arithmetic number, because the mean of its divisors is an integer number (927294240).

Almost surely, 2^6491059638 is an apocalyptic number.

6491059638 is an abundant number, since it is smaller than the sum of its proper divisors (8345648202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6491059638 is a wasteful number, since it uses less digits than its factorization.

6491059638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154549051.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 6491059638 is about 80567.1126328851. The cubic root of 6491059638 is about 1865.3995447652.

The spelling of 6491059638 in words is "six billion, four hundred ninety-one million, fifty-nine thousand, six hundred thirty-eight".