1356666889 has 4 divisors (see below), whose sum is σ = 1359815040. Its totient is φ = 1353518740.

The previous prime is 1356666863. The next prime is 1356666907. The reversal of 1356666889 is 9886666531.

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 1356666889 - 2²⁷ = 1222449161 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1356666859) 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, 1573429 + ... + 1574290.

It is an arithmetic number, because the mean of its divisors is an integer number (339953760).

Almost surely, 2^1356666889 is an apocalyptic number.

It is an amenable number.

1356666889 is a deficient number, since it is larger than the sum of its proper divisors (3148151).

1356666889 is an equidigital number, since it uses as much as digits as its factorization.

1356666889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148150.

The product of its digits is 11197440, while the sum is 58.

The square root of 1356666889 is about 36832.9592756270. The cubic root of 1356666889 is about 1107.0257983780.

The spelling of 1356666889 in words is "one billion, three hundred fifty-six million, six hundred sixty-six thousand, eight hundred eighty-nine".