20143245499 has 4 divisors (see below), whose sum is σ = 21692725936. Its totient is φ = 18593765064.

The previous prime is 20143245491. The next prime is 20143245533. The reversal of 20143245499 is 99454234102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99454234102 = 2 ⋅49727117051.

It is a cyclic number.

It is not a de Polignac number, because 20143245499 - 2³ = 20143245491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20143245491) 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, 774740199 + ... + 774740224.

It is an arithmetic number, because the mean of its divisors is an integer number (5423181484).

Almost surely, 2^20143245499 is an apocalyptic number.

20143245499 is a deficient number, since it is larger than the sum of its proper divisors (1549480437).

20143245499 is a wasteful number, since it uses less digits than its factorization.

20143245499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549480436.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 20143245499 in words is "twenty billion, one hundred forty-three million, two hundred forty-five thousand, four hundred ninety-nine".