66650448090895 has 16 divisors (see below), whose sum is σ = 82588084992000. Its totient is φ = 51583140698400.

The previous prime is 66650448090893. The next prime is 66650448090899. The reversal of 66650448090895 is 59809084405666.

It is not a de Polignac number, because 66650448090895 - 2¹ = 66650448090893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650448090893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71226201 + ... + 72155890.

It is an arithmetic number, because the mean of its divisors is an integer number (5161755312000).

Almost surely, 2^{66650448090895} is an apocalyptic number.

66650448090895 is a deficient number, since it is larger than the sum of its proper divisors (15937636901105).

66650448090895 is a wasteful number, since it uses less digits than its factorization.

66650448090895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143385126.

The product of its (nonzero) digits is 447897600, while the sum is 70.

The spelling of 66650448090895 in words is "sixty-six trillion, six hundred fifty billion, four hundred forty-eight million, ninety thousand, eight hundred ninety-five".