75227072721 has 8 divisors (see below), whose sum is σ = 100778133024. Its totient is φ = 49913697120.

The previous prime is 75227072719. The next prime is 75227072819. The reversal of 75227072721 is 12727072257.

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

It is not a de Polignac number, because 75227072721 - 2¹ = 75227072719 is a prime.

It is a super-2 number, since 2×75227072721² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (75227062721) 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, 59420436 + ... + 59421701.

It is an arithmetic number, because the mean of its divisors is an integer number (12597266628).

Almost surely, 2^75227072721 is an apocalyptic number.

It is an amenable number.

75227072721 is a deficient number, since it is larger than the sum of its proper divisors (25551060303).

75227072721 is a wasteful number, since it uses less digits than its factorization.

75227072721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118842351.

The product of its (nonzero) digits is 192080, while the sum is 42.

The spelling of 75227072721 in words is "seventy-five billion, two hundred twenty-seven million, seventy-two thousand, seven hundred twenty-one".