1261859672856 has 32 divisors (see below), whose sum is σ = 3155164930800. Its totient is φ = 420551124480.

The previous prime is 1261859672833. The next prime is 1261859672861. The reversal of 1261859672856 is 6582769581621.

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, 4147941 + ... + 4441748.

Almost surely, 2^{1261859672856} is an apocalyptic number.

It is an amenable number.

1261859672856 is an abundant number, since it is smaller than the sum of its proper divisors (1893305257944).

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

1261859672856 is a wasteful number, since it uses less digits than its factorization.

1261859672856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8595819 (or 8595815 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 66.

The spelling of 1261859672856 in words is "one trillion, two hundred sixty-one billion, eight hundred fifty-nine million, six hundred seventy-two thousand, eight hundred fifty-six".