1662685321 has 6 divisors (see below), whose sum is σ = 1827579866. Its totient is φ = 1511532000.

The previous prime is 1662685267. The next prime is 1662685351. The reversal of 1662685321 is 1235862661.

It can be written as a sum of positive squares in only one way, i.e., 1270209600 + 392475721 = 35640^2 + 19811^2 .

It is not a de Polignac number, because 1662685321 - 2⁹ = 1662684809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662685351) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6870480 + ... + 6870721.

Almost surely, 2^1662685321 is an apocalyptic number.

1662685321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1662685321 is a deficient number, since it is larger than the sum of its proper divisors (164894545).

1662685321 is a wasteful number, since it uses less digits than its factorization.

1662685321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13741223 (or 13741212 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 1662685321 is about 40776.0385643333. The cubic root of 1662685321 is about 1184.6862673049.

The spelling of 1662685321 in words is "one billion, six hundred sixty-two million, six hundred eighty-five thousand, three hundred twenty-one".