1640515005 has 32 divisors (see below), whose sum is σ = 3069974400. Its totient is φ = 828890496.

The previous prime is 1640514983. The next prime is 1640515013. The reversal of 1640515005 is 5005150461.

It is a happy number.

1640515005 is a `hidden beast` number, since 1 + 640 + 5 + 15 + 0 + 0 + 5 = 666.

It is not a de Polignac number, because 1640515005 - 2⁷ = 1640514877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1640515005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317224 + ... + 322353.

It is an arithmetic number, because the mean of its divisors is an integer number (95936700).

Almost surely, 2^1640515005 is an apocalyptic number.

1640515005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1640515005 is a deficient number, since it is larger than the sum of its proper divisors (1429459395).

1640515005 is a wasteful number, since it uses less digits than its factorization.

1640515005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639610 (or 639604 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1640515005 is about 40503.2715345316. The cubic root of 1640515005 is about 1179.3971365091.

Adding to 1640515005 its reverse (5005150461), we get a palindrome (6645665466).

The spelling of 1640515005 in words is "one billion, six hundred forty million, five hundred fifteen thousand, five".