66647371547451 has 16 divisors (see below), whose sum is σ = 90580849910784. Its totient is φ = 43573496819424.

The previous prime is 66647371547443. The next prime is 66647371547501. The reversal of 66647371547451 is 15474517374666.

66647371547451 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 66647371547451 - 2³ = 66647371547443 is a prime.

It is a super-2 number, since 2×66647371547451² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66647371547411) 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 15 ways as a sum of consecutive naturals, for example, 94611901 + ... + 95313726.

It is an arithmetic number, because the mean of its divisors is an integer number (5661303119424).

Almost surely, 2^{66647371547451} is an apocalyptic number.

66647371547451 is a deficient number, since it is larger than the sum of its proper divisors (23933478363333).

66647371547451 is a wasteful number, since it uses less digits than its factorization.

66647371547451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189927890.

The product of its digits is 355622400, while the sum is 66.

The spelling of 66647371547451 in words is "sixty-six trillion, six hundred forty-seven billion, three hundred seventy-one million, five hundred forty-seven thousand, four hundred fifty-one".