1643434492703 has 4 divisors (see below), whose sum is σ = 1658511873480. Its totient is φ = 1628357111928.

The previous prime is 1643434492699. The next prime is 1643434492727. The reversal of 1643434492703 is 3072944343461.

It is a happy number.

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 1643434492703 - 2² = 1643434492699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643434492003) 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, 7538690225 + ... + 7538690442.

It is an arithmetic number, because the mean of its divisors is an integer number (414627968370).

Almost surely, 2^{1643434492703} is an apocalyptic number.

1643434492703 is a deficient number, since it is larger than the sum of its proper divisors (15077380777).

1643434492703 is a wasteful number, since it uses less digits than its factorization.

1643434492703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15077380776.

The product of its (nonzero) digits is 5225472, while the sum is 50.

The spelling of 1643434492703 in words is "one trillion, six hundred forty-three billion, four hundred thirty-four million, four hundred ninety-two thousand, seven hundred three".