7651821515 has 16 divisors (see below), whose sum is σ = 9899438976. Its totient is φ = 5644329600.

The previous prime is 7651821469. The next prime is 7651821553. The reversal of 7651821515 is 5151281567.

It is not a de Polignac number, because 7651821515 - 2⁸ = 7651821259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5396 + ... + 123825.

It is an arithmetic number, because the mean of its divisors is an integer number (618714936).

Almost surely, 2^7651821515 is an apocalyptic number.

7651821515 is a deficient number, since it is larger than the sum of its proper divisors (2247617461).

7651821515 is a wasteful number, since it uses less digits than its factorization.

7651821515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130150.

The product of its digits is 84000, while the sum is 41.

The square root of 7651821515 is about 87474.6907110851. The cubic root of 7651821515 is about 1970.5537120120.

The spelling of 7651821515 in words is "seven billion, six hundred fifty-one million, eight hundred twenty-one thousand, five hundred fifteen".