75664260240721 has 8 divisors (see below), whose sum is σ = 76050434718720. Its totient is φ = 75278106893808.

The previous prime is 75664260240719. The next prime is 75664260240739. The reversal of 75664260240721 is 12704206246657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75664260240721 - 2¹ = 75664260240719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75664260240421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1921930 + ... + 12450796.

It is an arithmetic number, because the mean of its divisors is an integer number (9506304339840).

Almost surely, 2^{75664260240721} is an apocalyptic number.

It is an amenable number.

75664260240721 is a deficient number, since it is larger than the sum of its proper divisors (386174477999).

75664260240721 is a wasteful number, since it uses less digits than its factorization.

75664260240721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10565543.

The product of its (nonzero) digits is 6773760, while the sum is 52.

The spelling of 75664260240721 in words is "seventy-five trillion, six hundred sixty-four billion, two hundred sixty million, two hundred forty thousand, seven hundred twenty-one".