1557772557609 has 8 divisors (see below), whose sum is σ = 2077035911680. Its totient is φ = 1038512120976.

The previous prime is 1557772557571. The next prime is 1557772557619. The reversal of 1557772557609 is 9067552777551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1557772557609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557772557609.

It is not an unprimeable number, because it can be changed into a prime (1557772557619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1428879 + ... + 2270955.

It is an arithmetic number, because the mean of its divisors is an integer number (259629488960).

Almost surely, 2^{1557772557609} is an apocalyptic number.

It is an amenable number.

1557772557609 is a deficient number, since it is larger than the sum of its proper divisors (519263354071).

1557772557609 is an equidigital number, since it uses as much as digits as its factorization.

1557772557609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458719.

The product of its (nonzero) digits is 162067500, while the sum is 66.

The spelling of 1557772557609 in words is "one trillion, five hundred fifty-seven billion, seven hundred seventy-two million, five hundred fifty-seven thousand, six hundred nine".