66004546651 has 4 divisors (see below), whose sum is σ = 67539536152. Its totient is φ = 64469557152.

The previous prime is 66004546649. The next prime is 66004546697. The reversal of 66004546651 is 15664540066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66004546651 - 2¹ = 66004546649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1534989457 = 66004546651 / (6 + 6 + 0 + 0 + 4 + 5 + 4 + 6 + 6 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66004546598 and 66004546607.

It is not an unprimeable number, because it can be changed into a prime (66004546451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767494686 + ... + 767494771.

It is an arithmetic number, because the mean of its divisors is an integer number (16884884038).

Almost surely, 2^66004546651 is an apocalyptic number.

66004546651 is a deficient number, since it is larger than the sum of its proper divisors (1534989501).

66004546651 is a wasteful number, since it uses less digits than its factorization.

66004546651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534989500.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 66004546651 in words is "sixty-six billion, four million, five hundred forty-six thousand, six hundred fifty-one".