66196378953 has 64 divisors (see below), whose sum is σ = 105189120000. Its totient is φ = 41051162880.

The previous prime is 66196378949. The next prime is 66196378981. The reversal of 66196378953 is 35987369166.

66196378953 is a `hidden beast` number, since 6 + 619 + 6 + 3 + 7 + 8 + 9 + 5 + 3 = 666.

It is not a de Polignac number, because 66196378953 - 2² = 66196378949 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66196378153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5552563 + ... + 5564471.

It is an arithmetic number, because the mean of its divisors is an integer number (1643580000).

Almost surely, 2^66196378953 is an apocalyptic number.

It is an amenable number.

66196378953 is a deficient number, since it is larger than the sum of its proper divisors (38992741047).

66196378953 is a wasteful number, since it uses less digits than its factorization.

66196378953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12207 (or 12201 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 63.

The spelling of 66196378953 in words is "sixty-six billion, one hundred ninety-six million, three hundred seventy-eight thousand, nine hundred fifty-three".