66257155643005 has 8 divisors (see below), whose sum is σ = 79508999769912. Its totient is φ = 53005449182208.

The previous prime is 66257155642991. The next prime is 66257155643027. The reversal of 66257155643005 is 50034655175266.

It can be written as a sum of positive squares in 4 ways, for example, as 15612953450329 + 50644202192676 = 3951323^2 + 7116474^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66257155643005 - 2⁷ = 66257155642877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33354712 + ... + 35285281.

It is an arithmetic number, because the mean of its divisors is an integer number (9938624971239).

Almost surely, 2^{66257155643005} is an apocalyptic number.

It is an amenable number.

66257155643005 is a deficient number, since it is larger than the sum of its proper divisors (13251844126907).

66257155643005 is a wasteful number, since it uses less digits than its factorization.

66257155643005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68833055.

The product of its (nonzero) digits is 22680000, while the sum is 55.

The spelling of 66257155643005 in words is "sixty-six trillion, two hundred fifty-seven billion, one hundred fifty-five million, six hundred forty-three thousand, five".