75721900688909 has 8 divisors (see below), whose sum is σ = 77857114107288. Its totient is φ = 73591354405440.

The previous prime is 75721900688737. The next prime is 75721900688927. The reversal of 75721900688909 is 90988600912757.

It can be written as a sum of positive squares in 4 ways, for example, as 58125528480100 + 17596372208809 = 7624010^2 + 4194803^2 .

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 75721900688909 - 2¹⁶ = 75721900623373 is a prime.

It is a super-2 number, since 2×75721900688909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75721900685909) 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, 1166750822 + ... + 1166815719.

It is an arithmetic number, because the mean of its divisors is an integer number (9732139263411).

Almost surely, 2^{75721900688909} is an apocalyptic number.

It is an amenable number.

75721900688909 is a deficient number, since it is larger than the sum of its proper divisors (2135213418379).

75721900688909 is a wasteful number, since it uses less digits than its factorization.

75721900688909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333567455.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 75721900688909 in words is "seventy-five trillion, seven hundred twenty-one billion, nine hundred million, six hundred eighty-eight thousand, nine hundred nine".