1020665132989 has 4 divisors (see below), whose sum is σ = 1023989775424. Its totient is φ = 1017340490556.

The previous prime is 1020665132987. The next prime is 1020665133011. The reversal of 1020665132989 is 9892315660201.

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 1020665132989 - 2¹ = 1020665132987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020665132987) 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, 1662320757 + ... + 1662321370.

It is an arithmetic number, because the mean of its divisors is an integer number (255997443856).

Almost surely, 2^{1020665132989} is an apocalyptic number.

It is an amenable number.

1020665132989 is a deficient number, since it is larger than the sum of its proper divisors (3324642435).

1020665132989 is an equidigital number, since it uses as much as digits as its factorization.

1020665132989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324642434.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 1020665132989 in words is "one trillion, twenty billion, six hundred sixty-five million, one hundred thirty-two thousand, nine hundred eighty-nine".