66421415514811 has 12 divisors (see below), whose sum is σ = 77382975221640. Its totient is φ = 56846249365920.

The previous prime is 66421415514781. The next prime is 66421415514827. The reversal of 66421415514811 is 11841551412466.

66421415514811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66421415514811 - 2¹³ = 66421415506619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66421415514211) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1028449570 + ... + 1028514151.

It is an arithmetic number, because the mean of its divisors is an integer number (6448581268470).

Almost surely, 2^{66421415514811} is an apocalyptic number.

66421415514811 is a deficient number, since it is larger than the sum of its proper divisors (10961559706829).

66421415514811 is a wasteful number, since it uses less digits than its factorization.

66421415514811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056964394 (or 2056964387 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

The spelling of 66421415514811 in words is "sixty-six trillion, four hundred twenty-one billion, four hundred fifteen million, five hundred fourteen thousand, eight hundred eleven".