6501721100601 has 16 divisors (see below), whose sum is σ = 8674452113408. Its totient is φ = 4331735830800.

The previous prime is 6501721100597. The next prime is 6501721100617. The reversal of 6501721100601 is 1060011271056.

It is not a de Polignac number, because 6501721100601 - 2² = 6501721100597 is a prime.

It is a super-2 number, since 2×6501721100601² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6501721100621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72171456 + ... + 72261486.

It is an arithmetic number, because the mean of its divisors is an integer number (542153257088).

Almost surely, 2^{6501721100601} is an apocalyptic number.

It is an amenable number.

6501721100601 is a deficient number, since it is larger than the sum of its proper divisors (2172731012807).

6501721100601 is a wasteful number, since it uses less digits than its factorization.

6501721100601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105012.

The product of its (nonzero) digits is 2520, while the sum is 30.

Adding to 6501721100601 its reverse (1060011271056), we get a palindrome (7561732371657).

The spelling of 6501721100601 in words is "six trillion, five hundred one billion, seven hundred twenty-one million, one hundred thousand, six hundred one".