6405718985 has 8 divisors (see below), whose sum is σ = 7704375360. Its totient is φ = 5112900144.

The previous prime is 6405718973. The next prime is 6405718997. The reversal of 6405718985 is 5898175046.

It is an interprime number because it is at equal distance from previous prime (6405718973) and next prime (6405718997).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6405718985 - 2¹⁴ = 6405702601 is a prime.

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, 1456967 + ... + 1461356.

It is an arithmetic number, because the mean of its divisors is an integer number (963046920).

Almost surely, 2^6405718985 is an apocalyptic number.

It is an amenable number.

6405718985 is a deficient number, since it is larger than the sum of its proper divisors (1298656375).

6405718985 is a wasteful number, since it uses less digits than its factorization.

6405718985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918767.

The product of its (nonzero) digits is 2419200, while the sum is 53.

The square root of 6405718985 is about 80035.7356747597. The cubic root of 6405718985 is about 1857.1883933199.

The spelling of 6405718985 in words is "six billion, four hundred five million, seven hundred eighteen thousand, nine hundred eighty-five".