1661628316 has 12 divisors (see below), whose sum is σ = 2920331232. Its totient is φ = 827247968.

The previous prime is 1661628313. The next prime is 1661628323. The reversal of 1661628316 is 6138261661.

It is a super-2 number, since 2×1661628316² = 5522017321065991712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661628313) 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, 890500 + ... + 892363.

It is an arithmetic number, because the mean of its divisors is an integer number (243360936).

Almost surely, 2^1661628316 is an apocalyptic number.

It is an amenable number.

1661628316 is a deficient number, since it is larger than the sum of its proper divisors (1258702916).

1661628316 is a wasteful number, since it uses less digits than its factorization.

1661628316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783100 (or 1783098 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1661628316 is about 40763.0753991894. The cubic root of 1661628316 is about 1184.4351705319.

Adding to 1661628316 its reverse (6138261661), we get a palindrome (7799889977).

The spelling of 1661628316 in words is "one billion, six hundred sixty-one million, six hundred twenty-eight thousand, three hundred sixteen".