1165670021 has 8 divisors (see below), whose sum is σ = 1192289760. Its totient is φ = 1139279152.

The previous prime is 1165669997. The next prime is 1165670039. The reversal of 1165670021 is 1200765611.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165670021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165673021) 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, 46895 + ... + 67308.

It is an arithmetic number, because the mean of its divisors is an integer number (149036220).

Almost surely, 2^1165670021 is an apocalyptic number.

It is an amenable number.

1165670021 is a deficient number, since it is larger than the sum of its proper divisors (26619739).

1165670021 is a wasteful number, since it uses less digits than its factorization.

1165670021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114435.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1165670021 is about 34141.9100373720. The cubic root of 1165670021 is about 1052.4267440922.

The spelling of 1165670021 in words is "one billion, one hundred sixty-five million, six hundred seventy thousand, twenty-one".