66271953633 has 16 divisors (see below), whose sum is σ = 90636864192. Its totient is φ = 43047008000.

The previous prime is 66271953619. The next prime is 66271953637. The reversal of 66271953633 is 33635917266.

It is a cyclic number.

It is not a de Polignac number, because 66271953633 - 2⁴ = 66271953617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66271953637) 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, 260403 + ... + 447608.

It is an arithmetic number, because the mean of its divisors is an integer number (5664804012).

Almost surely, 2^66271953633 is an apocalyptic number.

It is an amenable number.

66271953633 is a deficient number, since it is larger than the sum of its proper divisors (24364910559).

66271953633 is a wasteful number, since it uses less digits than its factorization.

66271953633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708816.

The product of its digits is 3674160, while the sum is 51.

The spelling of 66271953633 in words is "sixty-six billion, two hundred seventy-one million, nine hundred fifty-three thousand, six hundred thirty-three".