642650203403 has 4 divisors (see below), whose sum is σ = 692084834448. Its totient is φ = 593215572360.

The previous prime is 642650203399. The next prime is 642650203409. The reversal of 642650203403 is 304302056246.

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 642650203403 - 2² = 642650203399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642650203409) 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, 24717315503 + ... + 24717315528.

It is an arithmetic number, because the mean of its divisors is an integer number (173021208612).

Almost surely, 2^642650203403 is an apocalyptic number.

642650203403 is a deficient number, since it is larger than the sum of its proper divisors (49434631045).

642650203403 is a wasteful number, since it uses less digits than its factorization.

642650203403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49434631044.

The product of its (nonzero) digits is 103680, while the sum is 35.

Adding to 642650203403 its reverse (304302056246), we get a palindrome (946952259649).

The spelling of 642650203403 in words is "six hundred forty-two billion, six hundred fifty million, two hundred three thousand, four hundred three".