642112311261 has 8 divisors (see below), whose sum is σ = 861098591520. Its totient is φ = 425600452592.

The previous prime is 642112311241. The next prime is 642112311263. The reversal of 642112311261 is 162113211246.

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

It is a cyclic number.

It is not a de Polignac number, because 642112311261 - 2⁵ = 642112311229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642112311263) 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 7 ways as a sum of consecutive naturals, for example, 618604791 + ... + 618605828.

It is an arithmetic number, because the mean of its divisors is an integer number (107637323940).

Almost surely, 2^642112311261 is an apocalyptic number.

It is an amenable number.

642112311261 is a deficient number, since it is larger than the sum of its proper divisors (218986280259).

642112311261 is a wasteful number, since it uses less digits than its factorization.

642112311261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237210795.

The product of its digits is 3456, while the sum is 30.

The spelling of 642112311261 in words is "six hundred forty-two billion, one hundred twelve million, three hundred eleven thousand, two hundred sixty-one".