161099272587 has 12 divisors (see below), whose sum is σ = 236101413800. Its totient is φ = 97635922560.

The previous prime is 161099272547. The next prime is 161099272627. The reversal of 161099272587 is 785272990161.

It is an interprime number because it is at equal distance from previous prime (161099272547) and next prime (161099272627).

It is not a de Polignac number, because 161099272587 - 2¹¹ = 161099270539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161099272507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221899462 + ... + 221900187.

Almost surely, 2^161099272587 is an apocalyptic number.

161099272587 is a deficient number, since it is larger than the sum of its proper divisors (75002141213).

161099272587 is a wasteful number, since it uses less digits than its factorization.

161099272587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443799674 (or 443799663 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 161099272587 in words is "one hundred sixty-one billion, ninety-nine million, two hundred seventy-two thousand, five hundred eighty-seven".