261331510207 has 8 divisors (see below), whose sum is σ = 262366140960. Its totient is φ = 260297347680.

The previous prime is 261331510199. The next prime is 261331510211. The reversal of 261331510207 is 702015133162.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 261331510207 - 2³ = 261331510199 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 (261331510907) 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, 1023333 + ... + 1252945.

It is an arithmetic number, because the mean of its divisors is an integer number (32795767620).

Almost surely, 2^261331510207 is an apocalyptic number.

261331510207 is a deficient number, since it is larger than the sum of its proper divisors (1034630753).

261331510207 is a wasteful number, since it uses less digits than its factorization.

261331510207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234113.

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 261331510207 its reverse (702015133162), we get a palindrome (963346643369).

The spelling of 261331510207 in words is "two hundred sixty-one billion, three hundred thirty-one million, five hundred ten thousand, two hundred seven".