7651516538 has 4 divisors (see below), whose sum is σ = 11477274810. Its totient is φ = 3825758268.

The previous prime is 7651516531. The next prime is 7651516603. The reversal of 7651516538 is 8356151567.

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., 6216849409 + 1434667129 = 78847^2 + 37877^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7651516492 and 7651516501.

It is not an unprimeable number, because it can be changed into a prime (7651516531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1912879133 + ... + 1912879136.

Almost surely, 2^7651516538 is an apocalyptic number.

7651516538 is a deficient number, since it is larger than the sum of its proper divisors (3825758272).

7651516538 is a wasteful number, since it uses less digits than its factorization.

7651516538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3825758271.

The product of its digits is 756000, while the sum is 47.

The square root of 7651516538 is about 87472.9474637730. The cubic root of 7651516538 is about 1970.5275316861.

The spelling of 7651516538 in words is "seven billion, six hundred fifty-one million, five hundred sixteen thousand, five hundred thirty-eight".