66249611833 has 16 divisors (see below), whose sum is σ = 67743555264. Its totient is φ = 64776821760.

The previous prime is 66249611789. The next prime is 66249611837. The reversal of 66249611833 is 33811694266.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66249611833 is a prime.

It is a super-2 number, since 2×66249611833² (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 (66249611837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2792166 + ... + 2815792.

It is an arithmetic number, because the mean of its divisors is an integer number (4233972204).

Almost surely, 2^66249611833 is an apocalyptic number.

It is an amenable number.

66249611833 is a deficient number, since it is larger than the sum of its proper divisors (1493943431).

66249611833 is a wasteful number, since it uses less digits than its factorization.

66249611833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24072.

The product of its digits is 1119744, while the sum is 49.

The spelling of 66249611833 in words is "sixty-six billion, two hundred forty-nine million, six hundred eleven thousand, eight hundred thirty-three".