6921485742856 has 32 divisors (see below), whose sum is σ = 13754643761880. Its totient is φ = 3253979520000.

The previous prime is 6921485742781. The next prime is 6921485742869. The reversal of 6921485742856 is 6582475841296.

It can be written as a sum of positive squares in 4 ways, for example, as 6425038674756 + 496447068100 = 2534766^2 + 704590^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6921485742791 and 6921485742800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24784395 + ... + 25062106.

Almost surely, 2^{6921485742856} is an apocalyptic number.

It is an amenable number.

6921485742856 is a deficient number, since it is larger than the sum of its proper divisors (6833158019024).

6921485742856 is a wasteful number, since it uses less digits than its factorization.

6921485742856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49847545 (or 49847541 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 67.

The spelling of 6921485742856 in words is "six trillion, nine hundred twenty-one billion, four hundred eighty-five million, seven hundred forty-two thousand, eight hundred fifty-six".