1640169002 has 8 divisors (see below), whose sum is σ = 2520259812. Its totient is φ = 800082400.

The previous prime is 1640168989. The next prime is 1640169029. The reversal of 1640169002 is 2009610461.

It is a Cunningham number, because it is equal to 40499²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 1640169001 + 1 = 40499^2 + 1^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000949 + ... + 10001112.

Almost surely, 2^1640169002 is an apocalyptic number.

1640169002 is a deficient number, since it is larger than the sum of its proper divisors (880090810).

1640169002 is a wasteful number, since it uses less digits than its factorization.

1640169002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002104.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1640169002 is about 40499.0000123460. Note that the first 4 decimals coincide. The cubic root of 1640169002 is about 1179.3142146546.

Adding to 1640169002 its reverse (2009610461), we get a palindrome (3649779463).

The spelling of 1640169002 in words is "one billion, six hundred forty million, one hundred sixty-nine thousand, two".