1000778786556 has 48 divisors (see below), whose sum is σ = 2341079193600. Its totient is φ = 332746218112.

The previous prime is 1000778786551. The next prime is 1000778786573. The reversal of 1000778786556 is 6556878770001.

It is a super-2 number, since 2×1000778786556² (a number of 25 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 1000778786556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000778786551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48706021 + ... + 48726563.

It is an arithmetic number, because the mean of its divisors is an integer number (48772483200).

Almost surely, 2^{1000778786556} is an apocalyptic number.

It is an amenable number.

1000778786556 is an abundant number, since it is smaller than the sum of its proper divisors (1340300407044).

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

1000778786556 is a wasteful number, since it uses less digits than its factorization.

1000778786556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30658 (or 30656 counting only the distinct ones).

The product of its (nonzero) digits is 19756800, while the sum is 60.

The spelling of 1000778786556 in words is "one trillion, seven hundred seventy-eight million, seven hundred eighty-six thousand, five hundred fifty-six".