1557208683973 has 16 divisors (see below), whose sum is σ = 1605991014144. Its totient is φ = 1509151815360.

The previous prime is 1557208683931. The next prime is 1557208684001. The reversal of 1557208683973 is 3793868027551.

It is a cyclic number.

It is not a de Polignac number, because 1557208683973 - 2³⁷ = 1419769730501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557208483973) 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, 1555111 + ... + 2352187.

It is an arithmetic number, because the mean of its divisors is an integer number (100374438384).

Almost surely, 2^{1557208683973} is an apocalyptic number.

It is an amenable number.

1557208683973 is a deficient number, since it is larger than the sum of its proper divisors (48782330171).

1557208683973 is a wasteful number, since it uses less digits than its factorization.

1557208683973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797532.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 1557208683973 in words is "one trillion, five hundred fifty-seven billion, two hundred eight million, six hundred eighty-three thousand, nine hundred seventy-three".