161887161603 has 8 divisors (see below), whose sum is σ = 215857384128. Its totient is φ = 107920856744.

The previous prime is 161887161599. The next prime is 161887161607. The reversal of 161887161603 is 306161788161.

It is an interprime number because it is at equal distance from previous prime (161887161599) and next prime (161887161607).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161887161603 - 2² = 161887161599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161887161607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881601 + ... + 1049282.

It is an arithmetic number, because the mean of its divisors is an integer number (26982173016).

Almost surely, 2^161887161603 is an apocalyptic number.

161887161603 is a deficient number, since it is larger than the sum of its proper divisors (53970222525).

161887161603 is a wasteful number, since it uses less digits than its factorization.

161887161603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1958833.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 161887161603 in words is "one hundred sixty-one billion, eight hundred eighty-seven million, one hundred sixty-one thousand, six hundred three".