161633211351531 has 8 divisors (see below), whose sum is σ = 221335568697744. Its totient is φ = 104843164119840.

The previous prime is 161633211351503. The next prime is 161633211351539. The reversal of 161633211351531 is 135153112336161.

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

It is not a de Polignac number, because 161633211351531 - 2²¹ = 161633209254379 is a prime.

It is a super-2 number, since 2×161633211351531² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161633211351539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 728077528500 + ... + 728077528721.

It is an arithmetic number, because the mean of its divisors is an integer number (27666946087218).

Almost surely, 2^{161633211351531} is an apocalyptic number.

161633211351531 is a deficient number, since it is larger than the sum of its proper divisors (59702357346213).

161633211351531 is a wasteful number, since it uses less digits than its factorization.

161633211351531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456155057261.

The product of its digits is 145800, while the sum is 42.

Adding to 161633211351531 its reverse (135153112336161), we get a palindrome (296786323687692).

The spelling of 161633211351531 in words is "one hundred sixty-one trillion, six hundred thirty-three billion, two hundred eleven million, three hundred fifty-one thousand, five hundred thirty-one".