161606155016643 has 16 divisors (see below), whose sum is σ = 224845640388096. Its totient is φ = 103052148756480.

The previous prime is 161606155016611. The next prime is 161606155016651. The reversal of 161606155016643 is 346610551606161.

It is not a de Polignac number, because 161606155016643 - 2⁵ = 161606155016611 is a prime.

It is a super-2 number, since 2×161606155016643² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161606155016543) 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, 5110078 + ... + 18690243.

It is an arithmetic number, because the mean of its divisors is an integer number (14052852524256).

Almost surely, 2^{161606155016643} is an apocalyptic number.

161606155016643 is a deficient number, since it is larger than the sum of its proper divisors (63239485371453).

161606155016643 is a wasteful number, since it uses less digits than its factorization.

161606155016643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23898754.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 161606155016643 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred fifty-five million, sixteen thousand, six hundred forty-three".