1640952643 has 8 divisors (see below), whose sum is σ = 1819477296. Its totient is φ = 1467319200.

The previous prime is 1640952583. The next prime is 1640952679. The reversal of 1640952643 is 3462590461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640952643 - 2¹³ = 1640944451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640952596 and 1640952605.

It is not an unprimeable number, because it can be changed into a prime (1640952743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222096 + ... + 1223437.

It is an arithmetic number, because the mean of its divisors is an integer number (227434662).

Almost surely, 2^1640952643 is an apocalyptic number.

1640952643 is a deficient number, since it is larger than the sum of its proper divisors (178524653).

1640952643 is a wasteful number, since it uses less digits than its factorization.

1640952643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445605.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 1640952643 is about 40508.6736761400. The cubic root of 1640952643 is about 1179.5020025851.

The spelling of 1640952643 in words is "one billion, six hundred forty million, nine hundred fifty-two thousand, six hundred forty-three".