6499404550501 has 4 divisors (see below), whose sum is σ = 6499732607692. Its totient is φ = 6499076493312.

The previous prime is 6499404550481. The next prime is 6499404550511. The reversal of 6499404550501 is 1050554049946.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1472706029601 + 5026698520900 = 1213551^2 + 2242030^2 .

It is a cyclic number.

It is not a de Polignac number, because 6499404550501 - 2¹⁵ = 6499404517733 is a prime.

It is a super-2 number, since 2×6499404550501² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6499404550511) 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, 163998876 + ... + 164038501.

It is an arithmetic number, because the mean of its divisors is an integer number (1624933151923).

Almost surely, 2^{6499404550501} is an apocalyptic number.

It is an amenable number.

6499404550501 is a deficient number, since it is larger than the sum of its proper divisors (328057191).

6499404550501 is a wasteful number, since it uses less digits than its factorization.

6499404550501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328057190.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 6499404550501 in words is "six trillion, four hundred ninety-nine billion, four hundred four million, five hundred fifty thousand, five hundred one".