6511140657818 has 16 divisors (see below), whose sum is σ = 9875897730216. Its totient is φ = 3219307822080.

The previous prime is 6511140657787. The next prime is 6511140657823. The reversal of 6511140657818 is 8187560411156.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 770597798569 + 5740542859249 = 877837^2 + 2395943^2 .

It is a super-2 number, since 2×6511140657818² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6511140657818.

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, 33170453 + ... + 33366168.

Almost surely, 2^{6511140657818} is an apocalyptic number.

6511140657818 is a deficient number, since it is larger than the sum of its proper divisors (3364757072398).

6511140657818 is a wasteful number, since it uses less digits than its factorization.

6511140657818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66537169.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 6511140657818 in words is "six trillion, five hundred eleven billion, one hundred forty million, six hundred fifty-seven thousand, eight hundred eighteen".