75725512021 has 4 divisors (see below), whose sum is σ = 75726084672. Its totient is φ = 75724939372.

The previous prime is 75725512019. The next prime is 75725512033. The reversal of 75725512021 is 12021552757.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12021552757 = 19 ⋅632713303.

It is a cyclic number.

It is not a de Polignac number, because 75725512021 - 2¹ = 75725512019 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 (75725512081) 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, 24516 + ... + 389938.

It is an arithmetic number, because the mean of its divisors is an integer number (18931521168).

Almost surely, 2^75725512021 is an apocalyptic number.

It is an amenable number.

75725512021 is a deficient number, since it is larger than the sum of its proper divisors (572651).

75725512021 is a wasteful number, since it uses less digits than its factorization.

75725512021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572650.

The product of its (nonzero) digits is 49000, while the sum is 37.

The spelling of 75725512021 in words is "seventy-five billion, seven hundred twenty-five million, five hundred twelve thousand, twenty-one".