261142247523 has 32 divisors (see below), whose sum is σ = 379216396800. Its totient is φ = 159218390016.

The previous prime is 261142247521. The next prime is 261142247567. The reversal of 261142247523 is 325742241162.

It is not a de Polignac number, because 261142247523 - 2¹ = 261142247521 is a prime.

It is a super-3 number, since 3×261142247523³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261142247521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15898611 + ... + 15915027.

It is an arithmetic number, because the mean of its divisors is an integer number (11850512400).

Almost surely, 2^261142247523 is an apocalyptic number.

261142247523 is a deficient number, since it is larger than the sum of its proper divisors (118074149277).

261142247523 is a wasteful number, since it uses less digits than its factorization.

261142247523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26091.

The product of its digits is 161280, while the sum is 39.

Adding to 261142247523 its reverse (325742241162), we get a palindrome (586884488685).

The spelling of 261142247523 in words is "two hundred sixty-one billion, one hundred forty-two million, two hundred forty-seven thousand, five hundred twenty-three".