618781820766 has 16 divisors (see below), whose sum is σ = 1237584280464. Its totient is φ = 206257167104.

The previous prime is 618781820749. The next prime is 618781820801. The reversal of 618781820766 is 667028187816.

It is a happy number.

It is a super-2 number, since 2×618781820766² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 455571 + ... + 1202126.

It is an arithmetic number, because the mean of its divisors is an integer number (77349017529).

Almost surely, 2^618781820766 is an apocalyptic number.

618781820766 is an abundant number, since it is smaller than the sum of its proper divisors (618802459698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

618781820766 is a wasteful number, since it uses less digits than its factorization.

618781820766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719915.

The product of its (nonzero) digits is 10838016, while the sum is 60.

The spelling of 618781820766 in words is "six hundred eighteen billion, seven hundred eighty-one million, eight hundred twenty thousand, seven hundred sixty-six".