1066647778615 has 8 divisors (see below), whose sum is σ = 1280017351008. Its totient is φ = 853291545120.

The previous prime is 1066647778591. The next prime is 1066647778619. The reversal of 1066647778615 is 5168777466601.

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

It is not a de Polignac number, because 1066647778615 - 2⁵ = 1066647778583 is a prime.

It is a super-2 number, since 2×1066647778615² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066647778619) 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, 3157947 + ... + 3479356.

It is an arithmetic number, because the mean of its divisors is an integer number (160002168876).

Almost surely, 2^{1066647778615} is an apocalyptic number.

1066647778615 is a deficient number, since it is larger than the sum of its proper divisors (213369572393).

1066647778615 is an equidigital number, since it uses as much as digits as its factorization.

1066647778615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669449.

The product of its (nonzero) digits is 71124480, while the sum is 64.

The spelling of 1066647778615 in words is "one trillion, sixty-six billion, six hundred forty-seven million, seven hundred seventy-eight thousand, six hundred fifteen".