66263873121 has 32 divisors (see below), whose sum is σ = 100138705920. Its totient is φ = 43291377792.

The previous prime is 66263873119. The next prime is 66263873129. The reversal of 66263873121 is 12137836266.

66263873121 is a `hidden beast` number, since 6 + 6 + 2 + 638 + 7 + 3 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 66263873121 - 2¹ = 66263873119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66263873129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1208125 + ... + 1261781.

It is an arithmetic number, because the mean of its divisors is an integer number (3129334560).

Almost surely, 2^66263873121 is an apocalyptic number.

It is an amenable number.

66263873121 is a deficient number, since it is larger than the sum of its proper divisors (33874832799).

66263873121 is a wasteful number, since it uses less digits than its factorization.

66263873121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54582 (or 54576 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 66263873121 in words is "sixty-six billion, two hundred sixty-three million, eight hundred seventy-three thousand, one hundred twenty-one".