66757913481 has 32 divisors (see below), whose sum is σ = 103494481920. Its totient is φ = 37484878464.

The previous prime is 66757913477. The next prime is 66757913503. The reversal of 66757913481 is 18431975766.

It is a happy number.

It is not a de Polignac number, because 66757913481 - 2² = 66757913477 is a prime.

It is a super-2 number, since 2×66757913481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66757913401) 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 31 ways as a sum of consecutive naturals, for example, 3289341 + ... + 3309573.

It is an arithmetic number, because the mean of its divisors is an integer number (3234202560).

Almost surely, 2^66757913481 is an apocalyptic number.

It is an amenable number.

66757913481 is a deficient number, since it is larger than the sum of its proper divisors (36736568439).

66757913481 is a wasteful number, since it uses less digits than its factorization.

66757913481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22965.

The product of its digits is 7620480, while the sum is 57.

The spelling of 66757913481 in words is "sixty-six billion, seven hundred fifty-seven million, nine hundred thirteen thousand, four hundred eighty-one".