261656302466066 has 4 divisors (see below), whose sum is σ = 392484453699102. Its totient is φ = 130828151233032.

The previous prime is 261656302466029. The next prime is 261656302466131. The reversal of 261656302466066 is 660664203656162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 227854043677225 + 33802258788841 = 15094835^2 + 5813971^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261656302465996 and 261656302466014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65414075616515 + ... + 65414075616518.

Almost surely, 2^{261656302466066} is an apocalyptic number.

261656302466066 is a deficient number, since it is larger than the sum of its proper divisors (130828151233036).

261656302466066 is a wasteful number, since it uses less digits than its factorization.

261656302466066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130828151233035.

The product of its (nonzero) digits is 67184640, while the sum is 59.

The spelling of 261656302466066 in words is "two hundred sixty-one trillion, six hundred fifty-six billion, three hundred two million, four hundred sixty-six thousand, sixty-six".