7642358521 has 4 divisors (see below), whose sum is σ = 8734124032. Its totient is φ = 6550593012.

The previous prime is 7642358519. The next prime is 7642358561. The reversal of 7642358521 is 1258532467.

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: 1258532467 = 37 ⋅34014391.

It is a cyclic number.

It is not a de Polignac number, because 7642358521 - 2¹ = 7642358519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7642358561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545882745 + ... + 545882758.

It is an arithmetic number, because the mean of its divisors is an integer number (2183531008).

Almost surely, 2^7642358521 is an apocalyptic number.

It is an amenable number.

7642358521 is a deficient number, since it is larger than the sum of its proper divisors (1091765511).

7642358521 is a wasteful number, since it uses less digits than its factorization.

7642358521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091765510.

The product of its digits is 403200, while the sum is 43.

The square root of 7642358521 is about 87420.5840806386. The cubic root of 7642358521 is about 1969.7410501621.

The spelling of 7642358521 in words is "seven billion, six hundred forty-two million, three hundred fifty-eight thousand, five hundred twenty-one".