158011478021 has 4 divisors (see below), whose sum is σ = 158021642700. Its totient is φ = 158001313344.

The previous prime is 158011478011. The next prime is 158011478029. The reversal of 158011478021 is 120874110851.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84166132996 + 73845345025 = 290114^2 + 271745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158011478021 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 (158011478029) 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, 5058986 + ... + 5090123.

It is an arithmetic number, because the mean of its divisors is an integer number (39505410675).

Almost surely, 2^158011478021 is an apocalyptic number.

It is an amenable number.

158011478021 is a deficient number, since it is larger than the sum of its proper divisors (10164679).

158011478021 is a wasteful number, since it uses less digits than its factorization.

158011478021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10164678.

The product of its (nonzero) digits is 17920, while the sum is 38.

Adding to 158011478021 its reverse (120874110851), we get a palindrome (278885588872).

The spelling of 158011478021 in words is "one hundred fifty-eight billion, eleven million, four hundred seventy-eight thousand, twenty-one".