1801212278556 has 48 divisors (see below), whose sum is σ = 4249842650144. Its totient is φ = 593698553856.

The previous prime is 1801212278539. The next prime is 1801212278587. The reversal of 1801212278556 is 6558722121081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 671046 + ... + 2013138.

Almost surely, 2^{1801212278556} is an apocalyptic number.

It is a pronic number, being equal to 1342092×1342093.

It is an amenable number.

1801212278556 is an abundant number, since it is smaller than the sum of its proper divisors (2448630371588).

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

1801212278556 is a wasteful number, since it uses less digits than its factorization.

1801212278556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343350 (or 1343348 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 48.

The spelling of 1801212278556 in words is "one trillion, eight hundred one billion, two hundred twelve million, two hundred seventy-eight thousand, five hundred fifty-six".