1653640143 has 4 divisors (see below), whose sum is σ = 2204853528. Its totient is φ = 1102426760.

The previous prime is 1653640111. The next prime is 1653640147. The reversal of 1653640143 is 3410463561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1653640143 - 2⁵ = 1653640111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653640147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 275606688 + ... + 275606693.

It is an arithmetic number, because the mean of its divisors is an integer number (551213382).

Almost surely, 2^1653640143 is an apocalyptic number.

1653640143 is a deficient number, since it is larger than the sum of its proper divisors (551213385).

1653640143 is an equidigital number, since it uses as much as digits as its factorization.

1653640143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551213384.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1653640143 is about 40664.9744005821. The cubic root of 1653640143 is about 1182.5340884440.

The spelling of 1653640143 in words is "one billion, six hundred fifty-three million, six hundred forty thousand, one hundred forty-three".