6386740978621 has 8 divisors (see below), whose sum is σ = 6422935223520. Its totient is φ = 6350552446608.

The previous prime is 6386740978609. The next prime is 6386740978649. The reversal of 6386740978621 is 1268790476836.

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 6386740978621 - 2²⁵ = 6386707424189 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 (6386740978691) 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, 824055 + ... + 3667771.

It is an arithmetic number, because the mean of its divisors is an integer number (802866902940).

Almost surely, 2^{6386740978621} is an apocalyptic number.

It is an amenable number.

6386740978621 is a deficient number, since it is larger than the sum of its proper divisors (36194244899).

6386740978621 is a wasteful number, since it uses less digits than its factorization.

6386740978621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856443.

The product of its (nonzero) digits is 146313216, while the sum is 67.

The spelling of 6386740978621 in words is "six trillion, three hundred eighty-six billion, seven hundred forty million, nine hundred seventy-eight thousand, six hundred twenty-one".