161161551105537 has 16 divisors (see below), whose sum is σ = 217013532765120. Its totient is φ = 106375340184000.

The previous prime is 161161551105509. The next prime is 161161551105571. The reversal of 161161551105537 is 735501155161161.

It is a happy number.

It is not a de Polignac number, because 161161551105537 - 2⁸ = 161161551105281 is a prime.

It is a super-2 number, since 2×161161551105537² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161161551105637) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12099039 + ... + 21649707.

It is an arithmetic number, because the mean of its divisors is an integer number (13563345797820).

Almost surely, 2^{161161551105537} is an apocalyptic number.

It is an amenable number.

161161551105537 is a deficient number, since it is larger than the sum of its proper divisors (55851981659583).

161161551105537 is a wasteful number, since it uses less digits than its factorization.

161161551105537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9606464.

The product of its (nonzero) digits is 472500, while the sum is 48.

The spelling of 161161551105537 in words is "one hundred sixty-one trillion, one hundred sixty-one billion, five hundred fifty-one million, one hundred five thousand, five hundred thirty-seven".