261564252237233 has 8 divisors (see below), whose sum is σ = 285344002760256. Its totient is φ = 237784698737200.

The previous prime is 261564252237209. The next prime is 261564252237247. The reversal of 261564252237233 is 332732252465162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261564252237233 is a prime.

It is a super-2 number, since 2×261564252237233² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261564252137233) 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, 46473053 + ... + 51796458.

It is an arithmetic number, because the mean of its divisors is an integer number (35668000345032).

Almost surely, 2^{261564252237233} is an apocalyptic number.

It is an amenable number.

261564252237233 is a deficient number, since it is larger than the sum of its proper divisors (23779750523023).

261564252237233 is a wasteful number, since it uses less digits than its factorization.

261564252237233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98511495.

The product of its digits is 21772800, while the sum is 53.

The spelling of 261564252237233 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred fifty-two million, two hundred thirty-seven thousand, two hundred thirty-three".