76131155521 has 4 divisors (see below), whose sum is σ = 76361159344. Its totient is φ = 75901151700.

The previous prime is 76131155519. The next prime is 76131155531. The reversal of 76131155521 is 12555113167.

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 an emirpimes, since its reverse is a distinct semiprime: 12555113167 = 3299 ⋅3805733.

It is a cyclic number.

It is not a de Polignac number, because 76131155521 - 2¹ = 76131155519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76131155531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115001415 + ... + 115002076.

It is an arithmetic number, because the mean of its divisors is an integer number (19090289836).

Almost surely, 2^76131155521 is an apocalyptic number.

It is an amenable number.

76131155521 is a deficient number, since it is larger than the sum of its proper divisors (230003823).

76131155521 is a wasteful number, since it uses less digits than its factorization.

76131155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230003822.

The product of its digits is 31500, while the sum is 37.

Adding to 76131155521 its reverse (12555113167), we get a palindrome (88686268688).

The spelling of 76131155521 in words is "seventy-six billion, one hundred thirty-one million, one hundred fifty-five thousand, five hundred twenty-one".