66523090477 has 4 divisors (see below), whose sum is σ = 66524289436. Its totient is φ = 66521891520.

The previous prime is 66523090471. The next prime is 66523090489. The reversal of 66523090477 is 77409032566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77409032566 = 2 ⋅38704516283.

It can be written as a sum of positive squares in 2 ways, for example, as 19369402276 + 47153688201 = 139174^2 + 217149^2 .

It is a cyclic number.

It is not a de Polignac number, because 66523090477 - 2⁷ = 66523090349 is a prime.

It is a super-2 number, since 2×66523090477² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66523090477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66523090471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511998 + ... + 628639.

It is an arithmetic number, because the mean of its divisors is an integer number (16631072359).

Almost surely, 2^66523090477 is an apocalyptic number.

It is an amenable number.

66523090477 is a deficient number, since it is larger than the sum of its proper divisors (1198959).

66523090477 is a wasteful number, since it uses less digits than its factorization.

66523090477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198958.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 66523090477 in words is "sixty-six billion, five hundred twenty-three million, ninety thousand, four hundred seventy-seven".