66698567131 has 16 divisors (see below), whose sum is σ = 76364494848. Its totient is φ = 57067135200.

The previous prime is 66698567101. The next prime is 66698567231. The reversal of 66698567131 is 13176589666.

It is a cyclic number.

It is not a de Polignac number, because 66698567131 - 2⁵ = 66698567099 is a prime.

It is a super-2 number, since 2×66698567131² (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 (66698567101) 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, 10565466 + ... + 10571776.

It is an arithmetic number, because the mean of its divisors is an integer number (4772780928).

Almost surely, 2^66698567131 is an apocalyptic number.

66698567131 is a deficient number, since it is larger than the sum of its proper divisors (9665927717).

66698567131 is a wasteful number, since it uses less digits than its factorization.

66698567131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8802.

The product of its digits is 9797760, while the sum is 58.

The spelling of 66698567131 in words is "sixty-six billion, six hundred ninety-eight million, five hundred sixty-seven thousand, one hundred thirty-one".