6420977938406 has 16 divisors (see below), whose sum is σ = 9777037860720. Its totient is φ = 3161983139040.

The previous prime is 6420977938393. The next prime is 6420977938433. The reversal of 6420977938406 is 6048397790246.

It is a congruent number.

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, 3731441 + ... + 5173548.

It is an arithmetic number, because the mean of its divisors is an integer number (611064866295).

Almost surely, 2^{6420977938406} is an apocalyptic number.

6420977938406 is a deficient number, since it is larger than the sum of its proper divisors (3356059922314).

6420977938406 is a wasteful number, since it uses less digits than its factorization.

6420977938406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8910439.

The product of its (nonzero) digits is 109734912, while the sum is 65.

The spelling of 6420977938406 in words is "six trillion, four hundred twenty billion, nine hundred seventy-seven million, nine hundred thirty-eight thousand, four hundred six".