561115161501 has 4 divisors (see below), whose sum is σ = 748153548672. Its totient is φ = 374076774332.

The previous prime is 561115161473. The next prime is 561115161577. The reversal of 561115161501 is 105161511165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561115161501 - 2⁵ = 561115161469 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561115161301) 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, 93519193581 + ... + 93519193586.

It is an arithmetic number, because the mean of its divisors is an integer number (187038387168).

Almost surely, 2^561115161501 is an apocalyptic number.

It is an amenable number.

561115161501 is a deficient number, since it is larger than the sum of its proper divisors (187038387171).

561115161501 is a wasteful number, since it uses less digits than its factorization.

561115161501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187038387170.

The product of its (nonzero) digits is 4500, while the sum is 33.

Adding to 561115161501 its reverse (105161511165), we get a palindrome (666276672666).

The spelling of 561115161501 in words is "five hundred sixty-one billion, one hundred fifteen million, one hundred sixty-one thousand, five hundred one".