7566525137721 has 24 divisors (see below), whose sum is σ = 11192870176992. Its totient is φ = 4542915097600.

The previous prime is 7566525137657. The next prime is 7566525137747. The reversal of 7566525137721 is 1277315256657.

It is a happy number.

It is not a de Polignac number, because 7566525137721 - 2⁶ = 7566525137657 is a prime.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7566525137771) 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 23 ways as a sum of consecutive naturals, for example, 97365000 + ... + 97442681.

It is an arithmetic number, because the mean of its divisors is an integer number (466369590708).

Almost surely, 2^{7566525137721} is an apocalyptic number.

It is an amenable number.

7566525137721 is a deficient number, since it is larger than the sum of its proper divisors (3626345039271).

7566525137721 is a wasteful number, since it uses less digits than its factorization.

7566525137721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194807813 (or 194807802 counting only the distinct ones).

The product of its digits is 18522000, while the sum is 57.

The spelling of 7566525137721 in words is "seven trillion, five hundred sixty-six billion, five hundred twenty-five million, one hundred thirty-seven thousand, seven hundred twenty-one".