6840279400564 has 6 divisors (see below), whose sum is σ = 11970488950994. Its totient is φ = 3420139700280.

The previous prime is 6840279400561. The next prime is 6840279400571. The reversal of 6840279400564 is 4650049720486.

It can be written as a sum of positive squares in only one way, i.e., 4544963499664 + 2295315900900 = 2131892^2 + 1515030^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840279400561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 855034925067 + ... + 855034925074.

Almost surely, 2^{6840279400564} is an apocalyptic number.

It is an amenable number.

6840279400564 is a deficient number, since it is larger than the sum of its proper divisors (5130209550430).

6840279400564 is a wasteful number, since it uses less digits than its factorization.

6840279400564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710069850145 (or 1710069850143 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 6840279400564 in words is "six trillion, eight hundred forty billion, two hundred seventy-nine million, four hundred thousand, five hundred sixty-four".