7521318474442 has 4 divisors (see below), whose sum is σ = 11281977711666. Its totient is φ = 3760659237220.

The previous prime is 7521318474403. The next prime is 7521318474451. The reversal of 7521318474442 is 2444748131257.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6569794311921 + 951524162521 = 2563161^2 + 975461^2 .

It is a super-2 number, since 2×7521318474442² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7521318474442.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1880329618609 + ... + 1880329618612.

Almost surely, 2^{7521318474442} is an apocalyptic number.

7521318474442 is a deficient number, since it is larger than the sum of its proper divisors (3760659237224).

7521318474442 is a wasteful number, since it uses less digits than its factorization.

7521318474442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3760659237223.

The product of its digits is 6021120, while the sum is 52.

The spelling of 7521318474442 in words is "seven trillion, five hundred twenty-one billion, three hundred eighteen million, four hundred seventy-four thousand, four hundred forty-two".