261188456356 has 27 divisors (see below), whose sum is σ = 472357241643. Its totient is φ = 126366179160.

The previous prime is 261188456317. The next prime is 261188456369. The reversal of 261188456356 is 653654881162.

The square root of 261188456356 is 511066.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261188456297 and 261188456306.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31681971 + ... + 31690213.

Almost surely, 2^261188456356 is an apocalyptic number.

261188456356 is the 511066-th square number.

It is an amenable number.

261188456356 is a deficient number, since it is larger than the sum of its proper divisors (211168785287).

261188456356 is an frugal number, since it uses more digits than its factorization.

261188456356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16552 (or 8276 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 55.

The spelling of 261188456356 in words is "two hundred sixty-one billion, one hundred eighty-eight million, four hundred fifty-six thousand, three hundred fifty-six".