158461641221 has 16 divisors (see below), whose sum is σ = 184891379904. Its totient is φ = 134466441984.

The previous prime is 158461641197. The next prime is 158461641223. The reversal of 158461641221 is 122146164851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158461641221 is a prime.

It is a super-2 number, since 2×158461641221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158461641223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8327951 + ... + 8346956.

It is an arithmetic number, because the mean of its divisors is an integer number (11555711244).

Almost surely, 2^158461641221 is an apocalyptic number.

It is an amenable number.

158461641221 is a deficient number, since it is larger than the sum of its proper divisors (26429738683).

158461641221 is a wasteful number, since it uses less digits than its factorization.

158461641221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16674980.

The product of its digits is 92160, while the sum is 41.

The spelling of 158461641221 in words is "one hundred fifty-eight billion, four hundred sixty-one million, six hundred forty-one thousand, two hundred twenty-one".