161595987026 has 4 divisors (see below), whose sum is σ = 242393980542. Its totient is φ = 80797993512.

The previous prime is 161595987023. The next prime is 161595987037. The reversal of 161595987026 is 620789595161.

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

It can be written as a sum of positive squares in only one way, i.e., 145820878225 + 15775108801 = 381865^2 + 125599^2 .

It is a super-2 number, since 2×161595987026² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161595987023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40398996755 + ... + 40398996758.

Almost surely, 2^161595987026 is an apocalyptic number.

161595987026 is a deficient number, since it is larger than the sum of its proper divisors (80797993516).

161595987026 is an equidigital number, since it uses as much as digits as its factorization.

161595987026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80797993515.

The product of its (nonzero) digits is 8164800, while the sum is 59.

The spelling of 161595987026 in words is "one hundred sixty-one billion, five hundred ninety-five million, nine hundred eighty-seven thousand, twenty-six".