355666989 has 4 divisors (see below), whose sum is σ = 474222656. Its totient is φ = 237111324.

The previous prime is 355666981. The next prime is 355667003. The reversal of 355666989 is 989666553.

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 not a de Polignac number, because 355666989 - 2³ = 355666981 is a prime.

It is a super-2 number, since 2×355666989² = 252998014128652242, which 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 (355666981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59277829 + ... + 59277834.

It is an arithmetic number, because the mean of its divisors is an integer number (118555664).

Almost surely, 2^355666989 is an apocalyptic number.

It is an amenable number.

355666989 is a deficient number, since it is larger than the sum of its proper divisors (118555667).

355666989 is a wasteful number, since it uses less digits than its factorization.

355666989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118555666.

The product of its digits is 10497600, while the sum is 57.

The square root of 355666989 is about 18859.1354255703. The cubic root of 355666989 is about 708.5130482068.

The spelling of 355666989 in words is "three hundred fifty-five million, six hundred sixty-six thousand, nine hundred eighty-nine".