261423423037 has 4 divisors (see below), whose sum is σ = 298769626336. Its totient is φ = 224077219740.

The previous prime is 261423423017. The next prime is 261423423043. The reversal of 261423423037 is 730324324162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261423423037 - 2³¹ = 259275939389 is a prime.

It is a super-2 number, since 2×261423423037² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261423422987 and 261423423005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261423423007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18673101639 + ... + 18673101652.

It is an arithmetic number, because the mean of its divisors is an integer number (74692406584).

Almost surely, 2^261423423037 is an apocalyptic number.

It is an amenable number.

261423423037 is a deficient number, since it is larger than the sum of its proper divisors (37346203299).

261423423037 is an equidigital number, since it uses as much as digits as its factorization.

261423423037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37346203298.

The product of its (nonzero) digits is 145152, while the sum is 37.

Adding to 261423423037 its reverse (730324324162), we get a palindrome (991747747199).

The spelling of 261423423037 in words is "two hundred sixty-one billion, four hundred twenty-three million, four hundred twenty-three thousand, thirty-seven".