161666150055515 has 16 divisors (see below), whose sum is σ = 228865628098560. Its totient is φ = 107280763169760.

The previous prime is 161666150055499. The next prime is 161666150055517. The reversal of 161666150055515 is 515550051666161.

161666150055515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161666150055515 - 2⁴ = 161666150055499 is a prime.

It is a super-2 number, since 2×161666150055515² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161666150055517) 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, 74500528895 + ... + 74500531064.

It is an arithmetic number, because the mean of its divisors is an integer number (14304101756160).

Almost surely, 2^{161666150055515} is an apocalyptic number.

161666150055515 is a deficient number, since it is larger than the sum of its proper divisors (67199478043045).

161666150055515 is a wasteful number, since it uses less digits than its factorization.

161666150055515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149001060002.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 161666150055515 in words is "one hundred sixty-one trillion, six hundred sixty-six billion, one hundred fifty million, fifty-five thousand, five hundred fifteen".