123749060561 has 4 divisors (see below), whose sum is σ = 141427497792. Its totient is φ = 106070623332.

The previous prime is 123749060557. The next prime is 123749060573. The reversal of 123749060561 is 165060947321.

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 123749060561 - 2² = 123749060557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123749060521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8839218605 + ... + 8839218618.

It is an arithmetic number, because the mean of its divisors is an integer number (35356874448).

Almost surely, 2^123749060561 is an apocalyptic number.

It is an amenable number.

123749060561 is a deficient number, since it is larger than the sum of its proper divisors (17678437231).

123749060561 is an equidigital number, since it uses as much as digits as its factorization.

123749060561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17678437230.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 123749060561 in words is "one hundred twenty-three billion, seven hundred forty-nine million, sixty thousand, five hundred sixty-one".