2561967123 has 8 divisors (see below), whose sum is σ = 3499272336. Its totient is φ = 1666320000.

The previous prime is 2561967119. The next prime is 2561967139. The reversal of 2561967123 is 3217691652.

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

It is not a de Polignac number, because 2561967123 - 2² = 2561967119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2561967143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10414378 + ... + 10414623.

It is an arithmetic number, because the mean of its divisors is an integer number (437409042).

Almost surely, 2^2561967123 is an apocalyptic number.

2561967123 is a deficient number, since it is larger than the sum of its proper divisors (937305213).

2561967123 is a wasteful number, since it uses less digits than its factorization.

2561967123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20829045.

The product of its digits is 136080, while the sum is 42.

The square root of 2561967123 is about 50615.8781707875. The cubic root of 2561967123 is about 1368.3310564882.

The spelling of 2561967123 in words is "two billion, five hundred sixty-one million, nine hundred sixty-seven thousand, one hundred twenty-three".