1561551560078 has 8 divisors (see below), whose sum is σ = 2342340978120. Its totient is φ = 780771234040.

The previous prime is 1561551560071. The next prime is 1561551560131. The reversal of 1561551560078 is 8700651551651.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561551560071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826048 + ... + 2541171.

It is an arithmetic number, because the mean of its divisors is an integer number (292792622265).

Almost surely, 2^{1561551560078} is an apocalyptic number.

1561551560078 is a deficient number, since it is larger than the sum of its proper divisors (780789418042).

1561551560078 is a wasteful number, since it uses less digits than its factorization.

1561551560078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546002.

The product of its (nonzero) digits is 1260000, while the sum is 50.

The spelling of 1561551560078 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-one million, five hundred sixty thousand, seventy-eight".