161540256641564 has 24 divisors (see below), whose sum is σ = 286102275328128. Its totient is φ = 79796755234800.

The previous prime is 161540256641549. The next prime is 161540256641593. The reversal of 161540256641564 is 465146652045161.

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, 171482039 + ... + 172421489.

It is an arithmetic number, because the mean of its divisors is an integer number (11920928138672).

Almost surely, 2^{161540256641564} is an apocalyptic number.

It is an amenable number.

161540256641564 is a deficient number, since it is larger than the sum of its proper divisors (124562018686564).

161540256641564 is a wasteful number, since it uses less digits than its factorization.

161540256641564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457465 (or 1457463 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 56.

The spelling of 161540256641564 in words is "one hundred sixty-one trillion, five hundred forty billion, two hundred fifty-six million, six hundred forty-one thousand, five hundred sixty-four".