1561340766 has 8 divisors (see below), whose sum is σ = 3122681544. Its totient is φ = 520446920.

The previous prime is 1561340747. The next prime is 1561340771. The reversal of 1561340766 is 6670431651.

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

1561340766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130111725 + ... + 130111736.

It is an arithmetic number, because the mean of its divisors is an integer number (390335193).

Almost surely, 2^1561340766 is an apocalyptic number.

1561340766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561340766 is a wasteful number, since it uses less digits than its factorization.

1561340766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260223466.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 1561340766 is about 39513.8047522635. The cubic root of 1561340766 is about 1160.1101674005.

The spelling of 1561340766 in words is "one billion, five hundred sixty-one million, three hundred forty thousand, seven hundred sixty-six".