161133141232621 has 4 divisors (see below), whose sum is σ = 164880423586912. Its totient is φ = 157385858878332.

The previous prime is 161133141232607. The next prime is 161133141232663. The reversal of 161133141232621 is 126232141331161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161133141232621 - 2⁷ = 161133141232493 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 (161133141232121) 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, 1873641177081 + ... + 1873641177166.

It is an arithmetic number, because the mean of its divisors is an integer number (41220105896728).

Almost surely, 2^{161133141232621} is an apocalyptic number.

It is an amenable number.

161133141232621 is a deficient number, since it is larger than the sum of its proper divisors (3747282354291).

161133141232621 is an equidigital number, since it uses as much as digits as its factorization.

161133141232621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747282354290.

The product of its digits is 31104, while the sum is 37.

Adding to 161133141232621 its reverse (126232141331161), we get a palindrome (287365282563782).

The spelling of 161133141232621 in words is "one hundred sixty-one trillion, one hundred thirty-three billion, one hundred forty-one million, two hundred thirty-two thousand, six hundred twenty-one".