1557038277221 has 16 divisors (see below), whose sum is σ = 1787617886208. Its totient is φ = 1328496174000.

The previous prime is 1557038277217. The next prime is 1557038277239. The reversal of 1557038277221 is 1227728307551.

It is a cyclic number.

It is not a de Polignac number, because 1557038277221 - 2² = 1557038277217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1557038277221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557038277271) 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, 19395956 + ... + 19476066.

It is an arithmetic number, because the mean of its divisors is an integer number (111726117888).

Almost surely, 2^{1557038277221} is an apocalyptic number.

It is an amenable number.

1557038277221 is a deficient number, since it is larger than the sum of its proper divisors (230579608987).

1557038277221 is a wasteful number, since it uses less digits than its factorization.

1557038277221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92792.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The spelling of 1557038277221 in words is "one trillion, five hundred fifty-seven billion, thirty-eight million, two hundred seventy-seven thousand, two hundred twenty-one".