261245344407 has 8 divisors (see below), whose sum is σ = 348363911040. Its totient is φ = 174145170360.

The previous prime is 261245344357. The next prime is 261245344457. The reversal of 261245344407 is 704443542162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261245344357) and next prime (261245344457).

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

It is not a de Polignac number, because 261245344407 - 2⁷ = 261245344279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261245344457) 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, 4564969 + ... + 4621842.

It is an arithmetic number, because the mean of its divisors is an integer number (43545488880).

Almost surely, 2^261245344407 is an apocalyptic number.

261245344407 is a deficient number, since it is larger than the sum of its proper divisors (87118566633).

261245344407 is an equidigital number, since it uses as much as digits as its factorization.

261245344407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9196293.

The product of its (nonzero) digits is 645120, while the sum is 42.

Adding to 261245344407 its reverse (704443542162), we get a palindrome (965688886569).

The spelling of 261245344407 in words is "two hundred sixty-one billion, two hundred forty-five million, three hundred forty-four thousand, four hundred seven".