66407226481 has 8 divisors (see below), whose sum is σ = 66460590504. Its totient is φ = 66353888640.

The previous prime is 66407226467. The next prime is 66407226499. The reversal of 66407226481 is 18462270466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19325170225 + 47082056256 = 139015^2 + 216984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66407226481 - 2¹³ = 66407218289 is a prime.

It is a super-2 number, since 2×66407226481² (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 (66407226451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10576315 + ... + 10582591.

It is an arithmetic number, because the mean of its divisors is an integer number (8307573813).

Almost surely, 2^66407226481 is an apocalyptic number.

It is an amenable number.

66407226481 is a deficient number, since it is larger than the sum of its proper divisors (53364023).

66407226481 is a wasteful number, since it uses less digits than its factorization.

66407226481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13091.

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 66407226481 in words is "sixty-six billion, four hundred seven million, two hundred twenty-six thousand, four hundred eighty-one".