1561048529557 has 6 divisors (see below), whose sum is σ = 1715863259894. Its totient is φ = 1419135026760.

The previous prime is 1561048529507. The next prime is 1561048529603. The reversal of 1561048529557 is 7559258401651.

It can be written as a sum of positive squares in only one way, i.e., 1156541081476 + 404507448081 = 1075426^2 + 636009^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1561048529557 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 (1561048529507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6450613638 + ... + 6450613879.

Almost surely, 2^{1561048529557} is an apocalyptic number.

It is an amenable number.

1561048529557 is a deficient number, since it is larger than the sum of its proper divisors (154814730337).

1561048529557 is a wasteful number, since it uses less digits than its factorization.

1561048529557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901227539 (or 12901227528 counting only the distinct ones).

The product of its (nonzero) digits is 15120000, while the sum is 58.

The spelling of 1561048529557 in words is "one trillion, five hundred sixty-one billion, forty-eight million, five hundred twenty-nine thousand, five hundred fifty-seven".