66530797 has 4 divisors (see below), whose sum is σ = 66706720. Its totient is φ = 66354876.

The previous prime is 66530759. The next prime is 66530831. The reversal of 66530797 is 79703566.

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: 79703566 = 2 ⋅39851783.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66530797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66530297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87393 + ... + 88150.

It is an arithmetic number, because the mean of its divisors is an integer number (16676680).

Almost surely, 2^66530797 is an apocalyptic number.

It is an amenable number.

66530797 is a deficient number, since it is larger than the sum of its proper divisors (175923).

66530797 is a wasteful number, since it uses less digits than its factorization.

66530797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175922.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66530797 is about 8156.6412818022. The cubic root of 66530797 is about 405.2044834387.

The spelling of 66530797 in words is "sixty-six million, five hundred thirty thousand, seven hundred ninety-seven".