161155016558 has 4 divisors (see below), whose sum is σ = 241732524840. Its totient is φ = 80577508278.

The previous prime is 161155016543. The next prime is 161155016567. The reversal of 161155016558 is 855610551161.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40288754138 + ... + 40288754141.

It is an arithmetic number, because the mean of its divisors is an integer number (60433131210).

Almost surely, 2^161155016558 is an apocalyptic number.

161155016558 is a deficient number, since it is larger than the sum of its proper divisors (80577508282).

161155016558 is an equidigital number, since it uses as much as digits as its factorization.

161155016558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80577508281.

The product of its (nonzero) digits is 180000, while the sum is 44.

The spelling of 161155016558 in words is "one hundred sixty-one billion, one hundred fifty-five million, sixteen thousand, five hundred fifty-eight".