161601656610155 has 32 divisors (see below), whose sum is σ = 203765813796096. Its totient is φ = 122889882599424.

The previous prime is 161601656610131. The next prime is 161601656610169. The reversal of 161601656610155 is 551016656106161.

It is a cyclic number.

It is not a de Polignac number, because 161601656610155 - 2⁶ = 161601656610091 is a prime.

It is a super-2 number, since 2×161601656610155² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11840534 + ... + 21526763.

It is an arithmetic number, because the mean of its divisors is an integer number (6367681681128).

Almost surely, 2^{161601656610155} is an apocalyptic number.

161601656610155 is a deficient number, since it is larger than the sum of its proper divisors (42164157185941).

161601656610155 is a wasteful number, since it uses less digits than its factorization.

161601656610155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33367943.

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 161601656610155 in words is "one hundred sixty-one trillion, six hundred one billion, six hundred fifty-six million, six hundred ten thousand, one hundred fifty-five".