66288755501 has 4 divisors (see below), whose sum is σ = 66294678492. Its totient is φ = 66282832512.

The previous prime is 66288755471. The next prime is 66288755521. The reversal of 66288755501 is 10555788266.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10555788266 = 2 ⋅5277894133.

It can be written as a sum of positive squares in 2 ways, for example, as 15008700100 + 51280055401 = 122510^2 + 226451^2 .

It is a cyclic number.

It is not a de Polignac number, because 66288755501 - 2²² = 66284561197 is a prime.

It is a super-2 number, since 2×66288755501² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66288755521) 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, 2944676 + ... + 2967101.

It is an arithmetic number, because the mean of its divisors is an integer number (16573669623).

Almost surely, 2^66288755501 is an apocalyptic number.

It is an amenable number.

66288755501 is a deficient number, since it is larger than the sum of its proper divisors (5922991).

66288755501 is a wasteful number, since it uses less digits than its factorization.

66288755501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5922990.

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 66288755501 in words is "sixty-six billion, two hundred eighty-eight million, seven hundred fifty-five thousand, five hundred one".