66265412641 has 16 divisors (see below), whose sum is σ = 69869226240. Its totient is φ = 62758682560.

The previous prime is 66265412617. The next prime is 66265412669. The reversal of 66265412641 is 14621456266.

It is a cyclic number.

It is not a de Polignac number, because 66265412641 - 2¹⁷ = 66265281569 is a prime.

It is a super-2 number, since 2×66265412641² (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 (66265412341) 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, 323940 + ... + 487306.

It is an arithmetic number, because the mean of its divisors is an integer number (4366826640).

Almost surely, 2^66265412641 is an apocalyptic number.

It is an amenable number.

66265412641 is a deficient number, since it is larger than the sum of its proper divisors (3603813599).

66265412641 is a wasteful number, since it uses less digits than its factorization.

66265412641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163664.

The product of its digits is 414720, while the sum is 43.

The spelling of 66265412641 in words is "sixty-six billion, two hundred sixty-five million, four hundred twelve thousand, six hundred forty-one".