7520666381 has 4 divisors (see below), whose sum is σ = 7521624000. Its totient is φ = 7519708764.

The previous prime is 7520666359. The next prime is 7520666389. The reversal of 7520666381 is 1836660257.

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.

It is a cyclic number.

It is not a de Polignac number, because 7520666381 - 2¹⁰ = 7520665357 is a prime.

It is a super-2 number, since 2×7520666381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7520666389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466931 + ... + 482768.

It is an arithmetic number, because the mean of its divisors is an integer number (1880406000).

Almost surely, 2^7520666381 is an apocalyptic number.

It is an amenable number.

7520666381 is a deficient number, since it is larger than the sum of its proper divisors (957619).

7520666381 is an equidigital number, since it uses as much as digits as its factorization.

7520666381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957618.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 7520666381 is about 86721.7757025304. The cubic root of 7520666381 is about 1959.2300860738.

The spelling of 7520666381 in words is "seven billion, five hundred twenty million, six hundred sixty-six thousand, three hundred eighty-one".