161310661534 has 16 divisors (see below), whose sum is σ = 266384582640. Its totient is φ = 72650338560.

The previous prime is 161310661517. The next prime is 161310661541. The reversal of 161310661534 is 435166013161.

It is a super-2 number, since 2×161310661534² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161310661493 and 161310661502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33632019 + ... + 33636814.

It is an arithmetic number, because the mean of its divisors is an integer number (16649036415).

Almost surely, 2^161310661534 is an apocalyptic number.

161310661534 is a deficient number, since it is larger than the sum of its proper divisors (105073921106).

161310661534 is a wasteful number, since it uses less digits than its factorization.

161310661534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67268955.

The product of its (nonzero) digits is 38880, while the sum is 37.

Adding to 161310661534 its reverse (435166013161), we get a palindrome (596476674695).

The spelling of 161310661534 in words is "one hundred sixty-one billion, three hundred ten million, six hundred sixty-one thousand, five hundred thirty-four".