261054634453 has 4 divisors (see below), whose sum is σ = 261677676960. Its totient is φ = 260431591948.

The previous prime is 261054634433. The next prime is 261054634483. The reversal of 261054634453 is 354436450162.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-261054634453 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 (261054634403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311520625 + ... + 311521462.

It is an arithmetic number, because the mean of its divisors is an integer number (65419419240).

Almost surely, 2^261054634453 is an apocalyptic number.

It is an amenable number.

261054634453 is a deficient number, since it is larger than the sum of its proper divisors (623042507).

261054634453 is an equidigital number, since it uses as much as digits as its factorization.

261054634453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623042506.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 261054634453 in words is "two hundred sixty-one billion, fifty-four million, six hundred thirty-four thousand, four hundred fifty-three".