1661353337 has 4 divisors (see below), whose sum is σ = 1898689536. Its totient is φ = 1424017140.

The previous prime is 1661353313. The next prime is 1661353367. The reversal of 1661353337 is 7333531661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1661353337 - 2¹⁰ = 1661352313 is a prime.

It is a super-2 number, since 2×1661353337² = 5520189820722071138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661353337.

It is not an unprimeable number, because it can be changed into a prime (1661353367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118668089 + ... + 118668102.

It is an arithmetic number, because the mean of its divisors is an integer number (474672384).

Almost surely, 2^1661353337 is an apocalyptic number.

It is an amenable number.

1661353337 is a deficient number, since it is larger than the sum of its proper divisors (237336199).

1661353337 is an equidigital number, since it uses as much as digits as its factorization.

1661353337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237336198.

The product of its digits is 102060, while the sum is 38.

The square root of 1661353337 is about 40759.7023664305. The cubic root of 1661353337 is about 1184.3698304548.

Adding to 1661353337 its reverse (7333531661), we get a palindrome (8994884998).

The spelling of 1661353337 in words is "one billion, six hundred sixty-one million, three hundred fifty-three thousand, three hundred thirty-seven".