66261131560466 has 4 divisors (see below), whose sum is σ = 99391697340702. Its totient is φ = 33130565780232.

The previous prime is 66261131560453. The next prime is 66261131560483. The reversal of 66261131560466 is 66406513116266.

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., 34213316116225 + 32047815444241 = 5849215^2 + 5661079^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16565282890115 + ... + 16565282890118.

Almost surely, 2^{66261131560466} is an apocalyptic number.

66261131560466 is a deficient number, since it is larger than the sum of its proper divisors (33130565780236).

66261131560466 is a wasteful number, since it uses less digits than its factorization.

66261131560466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33130565780235.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 66261131560466 in words is "sixty-six trillion, two hundred sixty-one billion, one hundred thirty-one million, five hundred sixty thousand, four hundred sixty-six".