261023331625 has 32 divisors (see below), whose sum is σ = 394193509632. Its totient is φ = 168458745600.

The previous prime is 261023331619. The next prime is 261023331721. The reversal of 261023331625 is 526133320162.

It is not a de Polignac number, because 261023331625 - 2³ = 261023331617 is a prime.

It is a super-2 number, since 2×261023331625² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8759019 + ... + 8788768.

It is an arithmetic number, because the mean of its divisors is an integer number (12318547176).

Almost surely, 2^261023331625 is an apocalyptic number.

261023331625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261023331625 is a deficient number, since it is larger than the sum of its proper divisors (133170178007).

261023331625 is a wasteful number, since it uses less digits than its factorization.

261023331625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17547826 (or 17547816 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 261023331625 its reverse (526133320162), we get a palindrome (787156651787).

The spelling of 261023331625 in words is "two hundred sixty-one billion, twenty-three million, three hundred thirty-one thousand, six hundred twenty-five".