161555970206908 has 12 divisors (see below), whose sum is σ = 282726697981392. Its totient is φ = 80776913640800.

The previous prime is 161555970206903. The next prime is 161555970207001. The reversal of 161555970206908 is 809602079555161.

It is a super-2 number, since 2×161555970206908² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161555970206908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161555970206903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267526360 + ... + 268129567.

It is an arithmetic number, because the mean of its divisors is an integer number (23560558165116).

Almost surely, 2^{161555970206908} is an apocalyptic number.

It is an amenable number.

161555970206908 is a deficient number, since it is larger than the sum of its proper divisors (121170727774484).

161555970206908 is a wasteful number, since it uses less digits than its factorization.

161555970206908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535731332 (or 535731330 counting only the distinct ones).

The product of its (nonzero) digits is 40824000, while the sum is 64.

The spelling of 161555970206908 in words is "one hundred sixty-one trillion, five hundred fifty-five billion, nine hundred seventy million, two hundred six thousand, nine hundred eight".