158445821507 has 4 divisors (see below), whose sum is σ = 158654029656. Its totient is φ = 158237613360.

The previous prime is 158445821449. The next prime is 158445821533. The reversal of 158445821507 is 705128544851.

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

It is a cyclic number.

It is not a de Polignac number, because 158445821507 - 2¹⁰ = 158445820483 is a prime.

It is a super-3 number, since 3×158445821507³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158445821407) 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, 104102933 + ... + 104104454.

It is an arithmetic number, because the mean of its divisors is an integer number (39663507414).

Almost surely, 2^158445821507 is an apocalyptic number.

158445821507 is a deficient number, since it is larger than the sum of its proper divisors (208208149).

158445821507 is an equidigital number, since it uses as much as digits as its factorization.

158445821507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208208148.

The product of its (nonzero) digits is 1792000, while the sum is 50.

The spelling of 158445821507 in words is "one hundred fifty-eight billion, four hundred forty-five million, eight hundred twenty-one thousand, five hundred seven".