66060165551551 has 4 divisors (see below), whose sum is σ = 68932346662512. Its totient is φ = 63187984440592.

The previous prime is 66060165551503. The next prime is 66060165551581. The reversal of 66060165551551 is 15515556106066.

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 66060165551551 - 2¹¹ = 66060165549503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66060165551581) 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, 1436090555446 + ... + 1436090555491.

It is an arithmetic number, because the mean of its divisors is an integer number (17233086665628).

Almost surely, 2^{66060165551551} is an apocalyptic number.

66060165551551 is a deficient number, since it is larger than the sum of its proper divisors (2872181110961).

66060165551551 is a wasteful number, since it uses less digits than its factorization.

66060165551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872181110960.

The product of its (nonzero) digits is 4050000, while the sum is 52.

The spelling of 66060165551551 in words is "sixty-six trillion, sixty billion, one hundred sixty-five million, five hundred fifty-one thousand, five hundred fifty-one".