261425045001 has 4 divisors (see below), whose sum is σ = 348566726672. Its totient is φ = 174283363332.

The previous prime is 261425044997. The next prime is 261425045003. The reversal of 261425045001 is 100540524162.

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 not a de Polignac number, because 261425045001 - 2² = 261425044997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261425045001.

It is not an unprimeable number, because it can be changed into a prime (261425045003) 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, 43570840831 + ... + 43570840836.

It is an arithmetic number, because the mean of its divisors is an integer number (87141681668).

Almost surely, 2^261425045001 is an apocalyptic number.

It is an amenable number.

261425045001 is a deficient number, since it is larger than the sum of its proper divisors (87141681671).

261425045001 is an equidigital number, since it uses as much as digits as its factorization.

261425045001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87141681670.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 261425045001 its reverse (100540524162), we get a palindrome (361965569163).

The spelling of 261425045001 in words is "two hundred sixty-one billion, four hundred twenty-five million, forty-five thousand, one".