1693640563 has 8 divisors (see below), whose sum is σ = 1783224720. Its totient is φ = 1604100960.

The previous prime is 1693640561. The next prime is 1693640593. The reversal of 1693640563 is 3650463961.

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 1693640563 - 2¹ = 1693640561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1693640561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90993 + ... + 108013.

It is an arithmetic number, because the mean of its divisors is an integer number (222903090).

Almost surely, 2^1693640563 is an apocalyptic number.

1693640563 is a deficient number, since it is larger than the sum of its proper divisors (89584157).

1693640563 is a wasteful number, since it uses less digits than its factorization.

1693640563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22277.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 1693640563 is about 41153.8644965452. The cubic root of 1693640563 is about 1191.9931203434.

The spelling of 1693640563 in words is "one billion, six hundred ninety-three million, six hundred forty thousand, five hundred sixty-three".