66557763662890 has 32 divisors (see below), whose sum is σ = 125024454135936. Its totient is φ = 25463213920320.

The previous prime is 66557763662879. The next prime is 66557763662963. The reversal of 66557763662890 is 9826636775566.

66557763662890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10956037 + ... + 15910696.

It is an arithmetic number, because the mean of its divisors is an integer number (3907014191748).

Almost surely, 2^{66557763662890} is an apocalyptic number.

66557763662890 is a deficient number, since it is larger than the sum of its proper divisors (58466690473046).

66557763662890 is a wasteful number, since it uses less digits than its factorization.

66557763662890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26877534.

The product of its (nonzero) digits is 4115059200, while the sum is 76.

The spelling of 66557763662890 in words is "sixty-six trillion, five hundred fifty-seven billion, seven hundred sixty-three million, six hundred sixty-two thousand, eight hundred ninety".