1661265316 has 6 divisors (see below), whose sum is σ = 2907214310. Its totient is φ = 830632656.

The previous prime is 1661265269. The next prime is 1661265329. The reversal of 1661265316 is 6135621661.

It can be written as a sum of positive squares in only one way, i.e., 1451305216 + 209960100 = 38096^2 + 14490^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207658161 + ... + 207658168.

Almost surely, 2^1661265316 is an apocalyptic number.

It is an amenable number.

1661265316 is a deficient number, since it is larger than the sum of its proper divisors (1245948994).

1661265316 is a wasteful number, since it uses less digits than its factorization.

1661265316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415316333 (or 415316331 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 1661265316 is about 40758.6225969426. The cubic root of 1661265316 is about 1184.3489135201.

Adding to 1661265316 its reverse (6135621661), we get a palindrome (7796886977).

The spelling of 1661265316 in words is "one billion, six hundred sixty-one million, two hundred sixty-five thousand, three hundred sixteen".