261890177223 has 8 divisors (see below), whose sum is σ = 360450996736. Its totient is φ = 168961404600.

The previous prime is 261890177201. The next prime is 261890177261. The reversal of 261890177223 is 322771098162.

It is a happy number.

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

It is not a de Polignac number, because 261890177223 - 2²⁴ = 261873400007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261890177273) 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, 1408011613 + ... + 1408011798.

It is an arithmetic number, because the mean of its divisors is an integer number (45056374592).

Almost surely, 2^261890177223 is an apocalyptic number.

261890177223 is a deficient number, since it is larger than the sum of its proper divisors (98560819513).

261890177223 is a wasteful number, since it uses less digits than its factorization.

261890177223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816023445.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 261890177223 in words is "two hundred sixty-one billion, eight hundred ninety million, one hundred seventy-seven thousand, two hundred twenty-three".