66261065415243 has 8 divisors (see below), whose sum is σ = 88348125890256. Its totient is φ = 44174024275200.

The previous prime is 66261065415211. The next prime is 66261065415271. The reversal of 66261065415243 is 34251456016266.

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

It is not a de Polignac number, because 66261065415243 - 2⁵ = 66261065415211 is a prime.

It is a super-2 number, since 2×66261065415243² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66261065415043) 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, 8127603 + ... + 14091843.

It is an arithmetic number, because the mean of its divisors is an integer number (11043515736282).

Almost surely, 2^{66261065415243} is an apocalyptic number.

66261065415243 is a deficient number, since it is larger than the sum of its proper divisors (22087060475013).

66261065415243 is a wasteful number, since it uses less digits than its factorization.

66261065415243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9667485.

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 66261065415243 in words is "sixty-six trillion, two hundred sixty-one billion, sixty-five million, four hundred fifteen thousand, two hundred forty-three".