161610155050561 has 16 divisors (see below), whose sum is σ = 185776723557504. Its totient is φ = 137713539049344.

The previous prime is 161610155050493. The next prime is 161610155050567. The reversal of 161610155050561 is 165050551016161.

161610155050561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161610155050561 - 2⁹ = 161610155050049 is a prime.

It is a super-2 number, since 2×161610155050561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161610155050567) 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, 14891421 + ... + 23344693.

It is an arithmetic number, because the mean of its divisors is an integer number (11611045222344).

Almost surely, 2^{161610155050561} is an apocalyptic number.

It is an amenable number.

161610155050561 is a deficient number, since it is larger than the sum of its proper divisors (24166568506943).

161610155050561 is a wasteful number, since it uses less digits than its factorization.

161610155050561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8469240.

The product of its (nonzero) digits is 135000, while the sum is 43.

The spelling of 161610155050561 in words is "one hundred sixty-one trillion, six hundred ten billion, one hundred fifty-five million, fifty thousand, five hundred sixty-one".