1561882855 has 8 divisors (see below), whose sum is σ = 2018433312. Its totient is φ = 1153390368.

The previous prime is 1561882843. The next prime is 1561882867. The reversal of 1561882855 is 5582881651.

It is an interprime number because it is at equal distance from previous prime (1561882843) and next prime (1561882867).

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

It is not a de Polignac number, because 1561882855 - 2⁷ = 1561882727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561882799 and 1561882808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12014419 + ... + 12014548.

It is an arithmetic number, because the mean of its divisors is an integer number (252304164).

Almost surely, 2^1561882855 is an apocalyptic number.

1561882855 is a deficient number, since it is larger than the sum of its proper divisors (456550457).

1561882855 is a wasteful number, since it uses less digits than its factorization.

1561882855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24028985.

The product of its digits is 768000, while the sum is 49.

The square root of 1561882855 is about 39520.6636457436. The cubic root of 1561882855 is about 1160.2444131733.

The spelling of 1561882855 in words is "one billion, five hundred sixty-one million, eight hundred eighty-two thousand, eight hundred fifty-five".