1661513233 has 8 divisors (see below), whose sum is σ = 1704761856. Its totient is φ = 1618394400.

The previous prime is 1661513213. The next prime is 1661513251. The reversal of 1661513233 is 3323151661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661513233 is a prime.

It is a super-2 number, since 2×1661513233² = 5521252446868224578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661513195 and 1661513204.

It is not an unprimeable number, because it can be changed into a prime (1661513213) 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, 6241 + ... + 57982.

It is an arithmetic number, because the mean of its divisors is an integer number (213095232).

Almost surely, 2^1661513233 is an apocalyptic number.

It is an amenable number.

1661513233 is a deficient number, since it is larger than the sum of its proper divisors (43248623).

1661513233 is an equidigital number, since it uses as much as digits as its factorization.

1661513233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64895.

The product of its digits is 9720, while the sum is 31.

The square root of 1661513233 is about 40761.6637663381. The cubic root of 1661513233 is about 1184.4078255678.

Adding to 1661513233 its reverse (3323151661), we get a palindrome (4984664894).

The spelling of 1661513233 in words is "one billion, six hundred sixty-one million, five hundred thirteen thousand, two hundred thirty-three".