999999653 has 8 divisors (see below), whose sum is σ = 1059284160. Its totient is φ = 940766400.

The previous prime is 999999613. The next prime is 999999667. The reversal of 999999653 is 356999999.

It is a happy number.

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

It is not a de Polignac number, because 999999653 - 2²⁴ = 983222437 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31838 + ... + 54896.

It is an arithmetic number, because the mean of its divisors is an integer number (132410520).

Almost surely, 2^999999653 is an apocalyptic number.

It is an amenable number.

999999653 is a deficient number, since it is larger than the sum of its proper divisors (59284507).

999999653 is a wasteful number, since it uses less digits than its factorization.

999999653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25627.

The product of its digits is 47829690, while the sum is 68.

The square root of 999999653 is about 31622.7711151316. The cubic root of 999999653 is about 999.9998843333. Note that the first 3 decimals are identical.

The spelling of 999999653 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred fifty-three".