66528392969 has 4 divisors (see below), whose sum is σ = 66530727120. Its totient is φ = 66526058820.

The previous prime is 66528392933. The next prime is 66528393031. The reversal of 66528392969 is 96929382566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96929382566 = 2 ⋅48464691283.

It is a cyclic number.

It is not a de Polignac number, because 66528392969 - 2¹² = 66528388873 is a prime.

It is a super-2 number, since 2×66528392969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66528392269) 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, 1123787 + ... + 1181504.

It is an arithmetic number, because the mean of its divisors is an integer number (16632681780).

Almost surely, 2^66528392969 is an apocalyptic number.

It is an amenable number.

66528392969 is a deficient number, since it is larger than the sum of its proper divisors (2334151).

66528392969 is a wasteful number, since it uses less digits than its factorization.

66528392969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334150.

The product of its digits is 75582720, while the sum is 65.

The spelling of 66528392969 in words is "sixty-six billion, five hundred twenty-eight million, three hundred ninety-two thousand, nine hundred sixty-nine".