158666901 has 8 divisors (see below), whose sum is σ = 212060064. Its totient is φ = 105525840.

The previous prime is 158666881. The next prime is 158666909. The reversal of 158666901 is 109666851.

It is a happy number.

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

It is not a de Polignac number, because 158666901 - 2¹¹ = 158664853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158666909) 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, 61551 + ... + 64076.

It is an arithmetic number, because the mean of its divisors is an integer number (26507508).

Almost surely, 2^158666901 is an apocalyptic number.

It is an amenable number.

158666901 is a deficient number, since it is larger than the sum of its proper divisors (53393163).

158666901 is a wasteful number, since it uses less digits than its factorization.

158666901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126051.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 158666901 is about 12596.3050534671. The cubic root of 158666901 is about 541.3715716297.

Subtracting from 158666901 its reverse (109666851), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 158666901 in words is "one hundred fifty-eight million, six hundred sixty-six thousand, nine hundred one".