66010500016609 has 4 divisors (see below), whose sum is σ = 67545627924016. Its totient is φ = 64475372109204.

The previous prime is 66010500016597. The next prime is 66010500016627. The reversal of 66010500016609 is 90661000501066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66010500016609 - 2²³ = 66010491628001 is a prime.

It is a super-2 number, since 2×66010500016609² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66010500026609) 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, 767563953639 + ... + 767563953724.

It is an arithmetic number, because the mean of its divisors is an integer number (16886406981004).

Almost surely, 2^{66010500016609} is an apocalyptic number.

It is an amenable number.

66010500016609 is a deficient number, since it is larger than the sum of its proper divisors (1535127907407).

66010500016609 is a wasteful number, since it uses less digits than its factorization.

66010500016609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535127907406.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 66010500016609 in words is "sixty-six trillion, ten billion, five hundred million, sixteen thousand, six hundred nine".