6540251603 has 4 divisors (see below), whose sum is σ = 6541410960. Its totient is φ = 6539092248.

The previous prime is 6540251591. The next prime is 6540251617. The reversal of 6540251603 is 3061520456.

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 6540251603 - 2¹⁶ = 6540186067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6540251603.

It is not an unprimeable number, because it can be changed into a prime (6540251803) 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, 571175 + ... + 582512.

It is an arithmetic number, because the mean of its divisors is an integer number (1635352740).

Almost surely, 2^6540251603 is an apocalyptic number.

6540251603 is a deficient number, since it is larger than the sum of its proper divisors (1159357).

6540251603 is a wasteful number, since it uses less digits than its factorization.

6540251603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159356.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 6540251603 is about 80871.8220581186. The cubic root of 6540251603 is about 1870.0999501420.

The spelling of 6540251603 in words is "six billion, five hundred forty million, two hundred fifty-one thousand, six hundred three".