66305298507 has 96 divisors (see below), whose sum is σ = 111743483904. Its totient is φ = 34210123200.

The previous prime is 66305298491. The next prime is 66305298511. The reversal of 66305298507 is 70589250366.

It is a happy number.

It is not a de Polignac number, because 66305298507 - 2⁴ = 66305298491 is a prime.

It is a super-2 number, since 2×66305298507² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66305298507.

It is not an unprimeable number, because it can be changed into a prime (66305298517) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15743632 + ... + 15747842.

It is an arithmetic number, because the mean of its divisors is an integer number (1163994624).

Almost surely, 2^66305298507 is an apocalyptic number.

66305298507 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66305298507 is a deficient number, since it is larger than the sum of its proper divisors (45438185397).

66305298507 is a wasteful number, since it uses less digits than its factorization.

66305298507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357 (or 4338 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 66305298507 in words is "sixty-six billion, three hundred five million, two hundred ninety-eight thousand, five hundred seven".