261423504461 has 8 divisors (see below), whose sum is σ = 298913306304. Its totient is φ = 223969599360.

The previous prime is 261423504443. The next prime is 261423504473. The reversal of 261423504461 is 164405324162.

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-261423504461 is a prime.

It is a super-5 number, since 5×261423504461⁵ (a number of 58 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261423503461) 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, 8958575 + ... + 8987708.

It is an arithmetic number, because the mean of its divisors is an integer number (37364163288).

Almost surely, 2^261423504461 is an apocalyptic number.

It is an amenable number.

261423504461 is a deficient number, since it is larger than the sum of its proper divisors (37489801843).

261423504461 is a wasteful number, since it uses less digits than its factorization.

261423504461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17948371.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 261423504461 in words is "two hundred sixty-one billion, four hundred twenty-three million, five hundred four thousand, four hundred sixty-one".