1577879081549 has 8 divisors (see below), whose sum is σ = 1598708223360. Its totient is φ = 1557071339616.

The previous prime is 1577879081473. The next prime is 1577879081563. The reversal of 1577879081549 is 9451809787751.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1577879081549 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 (1577879081579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5201504 + ... + 5496489.

It is an arithmetic number, because the mean of its divisors is an integer number (199838527920).

Almost surely, 2^{1577879081549} is an apocalyptic number.

It is an amenable number.

1577879081549 is a deficient number, since it is larger than the sum of its proper divisors (20829141811).

1577879081549 is a wasteful number, since it uses less digits than its factorization.

1577879081549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10699939.

The product of its (nonzero) digits is 177811200, while the sum is 71.

The spelling of 1577879081549 in words is "one trillion, five hundred seventy-seven billion, eight hundred seventy-nine million, eighty-one thousand, five hundred forty-nine".