66036523311021 has 16 divisors (see below), whose sum is σ = 89042136770880. Its totient is φ = 43527675227520.

The previous prime is 66036523311001. The next prime is 66036523311041. The reversal of 66036523311021 is 12011332563066.

It is an interprime number because it is at equal distance from previous prime (66036523311001) and next prime (66036523311041).

It is not a de Polignac number, because 66036523311021 - 2⁶ = 66036523310957 is a prime.

It is a super-2 number, since 2×66036523311021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66036523311001) 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, 47871 + ... + 11492403.

It is an arithmetic number, because the mean of its divisors is an integer number (5565133548180).

Almost surely, 2^{66036523311021} is an apocalyptic number.

It is an amenable number.

66036523311021 is a deficient number, since it is larger than the sum of its proper divisors (23005613459859).

66036523311021 is a wasteful number, since it uses less digits than its factorization.

66036523311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466236.

The product of its (nonzero) digits is 116640, while the sum is 39.

Adding to 66036523311021 its reverse (12011332563066), we get a palindrome (78047855874087).

The spelling of 66036523311021 in words is "sixty-six trillion, thirty-six billion, five hundred twenty-three million, three hundred eleven thousand, twenty-one".