66475427651 has 16 divisors (see below), whose sum is σ = 67789467648. Its totient is φ = 65177244000.

The previous prime is 66475427633. The next prime is 66475427657. The reversal of 66475427651 is 15672457466.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66475427651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66475427593 and 66475427602.

It is not an unprimeable number, because it can be changed into a prime (66475427657) 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, 4563686 + ... + 4578228.

It is an arithmetic number, because the mean of its divisors is an integer number (4236841728).

Almost surely, 2^66475427651 is an apocalyptic number.

66475427651 is a deficient number, since it is larger than the sum of its proper divisors (1314039997).

66475427651 is a wasteful number, since it uses less digits than its factorization.

66475427651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15082.

The product of its digits is 8467200, while the sum is 53.

The spelling of 66475427651 in words is "sixty-six billion, four hundred seventy-five million, four hundred twenty-seven thousand, six hundred fifty-one".