161553670155 has 80 divisors (see below), whose sum is σ = 309136608000. Its totient is φ = 80477167680.

The previous prime is 161553670147. The next prime is 161553670169. The reversal of 161553670155 is 551076355161.

161553670155 is a `hidden beast` number, since 1 + 61 + 5 + 536 + 7 + 0 + 1 + 55 = 666.

It is not a de Polignac number, because 161553670155 - 2³ = 161553670147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161553670155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 398496 + ... + 694194.

It is an arithmetic number, because the mean of its divisors is an integer number (3864207600).

Almost surely, 2^161553670155 is an apocalyptic number.

161553670155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161553670155 is a deficient number, since it is larger than the sum of its proper divisors (147582937845).

161553670155 is a wasteful number, since it uses less digits than its factorization.

161553670155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295806 (or 295797 counting only the distinct ones).

The product of its (nonzero) digits is 472500, while the sum is 45.

The spelling of 161553670155 in words is "one hundred sixty-one billion, five hundred fifty-three million, six hundred seventy thousand, one hundred fifty-five".