561897948459 has 4 divisors (see below), whose sum is σ = 749197264616. Its totient is φ = 374598632304.

The previous prime is 561897948379. The next prime is 561897948467. The reversal of 561897948459 is 954849798165.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 561897948459 - 2²⁵ = 561864394027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561897948499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93649658074 + ... + 93649658079.

It is an arithmetic number, because the mean of its divisors is an integer number (187299316154).

Almost surely, 2^561897948459 is an apocalyptic number.

561897948459 is a deficient number, since it is larger than the sum of its proper divisors (187299316157).

561897948459 is a wasteful number, since it uses less digits than its factorization.

561897948459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187299316156.

The product of its digits is 783820800, while the sum is 75.

The spelling of 561897948459 in words is "five hundred sixty-one billion, eight hundred ninety-seven million, nine hundred forty-eight thousand, four hundred fifty-nine".