6402580991 has 16 divisors (see below), whose sum is σ = 6563773440. Its totient is φ = 6243712800.

The previous prime is 6402580981. The next prime is 6402580999. The reversal of 6402580991 is 1990852046.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6402580991 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 (6402580999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4682990 + ... + 4684356.

It is an arithmetic number, because the mean of its divisors is an integer number (410235840).

Almost surely, 2^6402580991 is an apocalyptic number.

6402580991 is a deficient number, since it is larger than the sum of its proper divisors (161192449).

6402580991 is a wasteful number, since it uses less digits than its factorization.

6402580991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 6402580991 is about 80016.1295677315. The cubic root of 6402580991 is about 1856.8850811315.

The spelling of 6402580991 in words is "six billion, four hundred two million, five hundred eighty thousand, nine hundred ninety-one".