66101165551 has 4 divisors (see below), whose sum is σ = 66129770704. Its totient is φ = 66072560400.

The previous prime is 66101165531. The next prime is 66101165561. The reversal of 66101165551 is 15556110166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66101165551 - 2¹¹ = 66101163503 is a prime.

It is a super-3 number, since 3×66101165551³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66101165551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66101165531) 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, 14299110 + ... + 14303731.

It is an arithmetic number, because the mean of its divisors is an integer number (16532442676).

Almost surely, 2^66101165551 is an apocalyptic number.

66101165551 is a deficient number, since it is larger than the sum of its proper divisors (28605153).

66101165551 is a wasteful number, since it uses less digits than its factorization.

66101165551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28605152.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 66101165551 in words is "sixty-six billion, one hundred one million, one hundred sixty-five thousand, five hundred fifty-one".