7158621538 has 4 divisors (see below), whose sum is σ = 10737932310. Its totient is φ = 3579310768.

The previous prime is 7158621497. The next prime is 7158621563. The reversal of 7158621538 is 8351268517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8351268517 = 55849 ⋅149533.

It can be written as a sum of positive squares in only one way, i.e., 6658070409 + 500551129 = 81597^2 + 22373^2 .

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, 1789655383 + ... + 1789655386.

Almost surely, 2^7158621538 is an apocalyptic number.

7158621538 is a deficient number, since it is larger than the sum of its proper divisors (3579310772).

7158621538 is a wasteful number, since it uses less digits than its factorization.

7158621538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579310771.

The product of its digits is 403200, while the sum is 46.

The square root of 7158621538 is about 84608.6374905068. The cubic root of 7158621538 is about 1927.2725430083.

The spelling of 7158621538 in words is "seven billion, one hundred fifty-eight million, six hundred twenty-one thousand, five hundred thirty-eight".