1158665721838 has 4 divisors (see below), whose sum is σ = 1737998582760. Its totient is φ = 579332860918.

The previous prime is 1158665721833. The next prime is 1158665721883. The reversal of 1158665721838 is 8381275668511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158665721833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 289666430458 + ... + 289666430461.

It is an arithmetic number, because the mean of its divisors is an integer number (434499645690).

Almost surely, 2^{1158665721838} is an apocalyptic number.

1158665721838 is a deficient number, since it is larger than the sum of its proper divisors (579332860922).

1158665721838 is an equidigital number, since it uses as much as digits as its factorization.

1158665721838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579332860921.

The product of its digits is 19353600, while the sum is 61.

The spelling of 1158665721838 in words is "one trillion, one hundred fifty-eight billion, six hundred sixty-five million, seven hundred twenty-one thousand, eight hundred thirty-eight".