261103154503 has 4 divisors (see below), whose sum is σ = 261475627608. Its totient is φ = 260730681400.

The previous prime is 261103154467. The next prime is 261103154519. The reversal of 261103154503 is 305451301162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261103154503 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 (261103151503) 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, 186235501 + ... + 186236902.

It is an arithmetic number, because the mean of its divisors is an integer number (65368906902).

Almost surely, 2^261103154503 is an apocalyptic number.

261103154503 is a deficient number, since it is larger than the sum of its proper divisors (372473105).

261103154503 is an equidigital number, since it uses as much as digits as its factorization.

261103154503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372473104.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 261103154503 its reverse (305451301162), we get a palindrome (566554455665).

The spelling of 261103154503 in words is "two hundred sixty-one billion, one hundred three million, one hundred fifty-four thousand, five hundred three".