1661157586 has 16 divisors (see below), whose sum is σ = 2737818720. Its totient is φ = 749638080.

The previous prime is 1661157577. The next prime is 1661157623. The reversal of 1661157586 is 6857511661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268551 + ... + 274666.

It is an arithmetic number, because the mean of its divisors is an integer number (171113670).

Almost surely, 2^1661157586 is an apocalyptic number.

1661157586 is a deficient number, since it is larger than the sum of its proper divisors (1076661134).

1661157586 is a wasteful number, since it uses less digits than its factorization.

1661157586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543369.

The product of its digits is 302400, while the sum is 46.

The square root of 1661157586 is about 40757.3010146648. The cubic root of 1661157586 is about 1184.3233120171.

It can be divided in two parts, 16611575 and 86, that added together give a palindrome (16611661).

The spelling of 1661157586 in words is "one billion, six hundred sixty-one million, one hundred fifty-seven thousand, five hundred eighty-six".