66188557253 has 16 divisors (see below), whose sum is σ = 81477532416. Its totient is φ = 52359523200.

The previous prime is 66188557199. The next prime is 66188557291. The reversal of 66188557253 is 35275588166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66188557253 - 2²⁰ = 66187508677 is a prime.

It is a super-2 number, since 2×66188557253² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66188554253) 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, 465200 + ... + 590582.

It is an arithmetic number, because the mean of its divisors is an integer number (5092345776).

Almost surely, 2^66188557253 is an apocalyptic number.

It is an amenable number.

66188557253 is a deficient number, since it is larger than the sum of its proper divisors (15288975163).

66188557253 is a wasteful number, since it uses less digits than its factorization.

66188557253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131204.

The product of its digits is 12096000, while the sum is 56.

The spelling of 66188557253 in words is "sixty-six billion, one hundred eighty-eight million, five hundred fifty-seven thousand, two hundred fifty-three".