1661852499 has 16 divisors (see below), whose sum is σ = 2337772800. Its totient is φ = 1047184416.

The previous prime is 1661852473. The next prime is 1661852509. The reversal of 1661852499 is 9942581661.

It is not a de Polignac number, because 1661852499 - 2⁸ = 1661852243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661852429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8184 + ... + 58229.

It is an arithmetic number, because the mean of its divisors is an integer number (146110800).

Almost surely, 2^1661852499 is an apocalyptic number.

1661852499 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1661852499 is a deficient number, since it is larger than the sum of its proper divisors (675920301).

1661852499 is a wasteful number, since it uses less digits than its factorization.

1661852499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66874.

The product of its digits is 933120, while the sum is 51.

The square root of 1661852499 is about 40765.8251357678. The cubic root of 1661852499 is about 1184.4884352094.

The spelling of 1661852499 in words is "one billion, six hundred sixty-one million, eight hundred fifty-two thousand, four hundred ninety-nine".