6442078490391 has 8 divisors (see below), whose sum is σ = 8866516632064. Its totient is φ = 4156179671160.

The previous prime is 6442078490387. The next prime is 6442078490467. The reversal of 6442078490391 is 1930948702446.

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

It is not a de Polignac number, because 6442078490391 - 2² = 6442078490387 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 (6442078490591) 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, 34634830501 + ... + 34634830686.

It is an arithmetic number, because the mean of its divisors is an integer number (1108314579008).

Almost surely, 2^{6442078490391} is an apocalyptic number.

6442078490391 is a deficient number, since it is larger than the sum of its proper divisors (2424438141673).

6442078490391 is a wasteful number, since it uses less digits than its factorization.

6442078490391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69269661221.

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 6442078490391 in words is "six trillion, four hundred forty-two billion, seventy-eight million, four hundred ninety thousand, three hundred ninety-one".