6501115501 has 4 divisors (see below), whose sum is σ = 6502063104. Its totient is φ = 6500167900.

The previous prime is 6501115483. The next prime is 6501115507. The reversal of 6501115501 is 1055111056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6501115501 - 2¹⁷ = 6500984429 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 (6501115507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463435 + ... + 477256.

It is an arithmetic number, because the mean of its divisors is an integer number (1625515776).

Almost surely, 2^6501115501 is an apocalyptic number.

It is an amenable number.

6501115501 is a deficient number, since it is larger than the sum of its proper divisors (947603).

6501115501 is an equidigital number, since it uses as much as digits as its factorization.

6501115501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947602.

The product of its (nonzero) digits is 750, while the sum is 25.

The square root of 6501115501 is about 80629.4952297235. The cubic root of 6501115501 is about 1866.3623317873.

Adding to 6501115501 its reverse (1055111056), we get a palindrome (7556226557).

The spelling of 6501115501 in words is "six billion, five hundred one million, one hundred fifteen thousand, five hundred one".