261536236652066 has 8 divisors (see below), whose sum is σ = 398953581333840. Its totient is φ = 128551709540788.

The previous prime is 261536236652059. The next prime is 261536236652071. The reversal of 261536236652066 is 660256632635162.

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

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a junction number, because it is equal to n+sod(n) for n = 261536236651996 and 261536236652014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108204392476 + ... + 1108204392711.

It is an arithmetic number, because the mean of its divisors is an integer number (49869197666730).

Almost surely, 2^{261536236652066} is an apocalyptic number.

261536236652066 is a deficient number, since it is larger than the sum of its proper divisors (137417344681774).

261536236652066 is a wasteful number, since it uses less digits than its factorization.

261536236652066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216408785248.

The product of its (nonzero) digits is 83980800, while the sum is 59.

The spelling of 261536236652066 in words is "two hundred sixty-one trillion, five hundred thirty-six billion, two hundred thirty-six million, six hundred fifty-two thousand, sixty-six".