2151521615615 has 8 divisors (see below), whose sum is σ = 2581872930528. Its totient is φ = 1721185964640.

The previous prime is 2151521615591. The next prime is 2151521615641. The reversal of 2151521615615 is 5165161251512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2151521615615 - 2¹⁰ = 2151521614591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3611651 + ... + 4164980.

It is an arithmetic number, because the mean of its divisors is an integer number (322734116316).

Almost surely, 2^{2151521615615} is an apocalyptic number.

2151521615615 is a deficient number, since it is larger than the sum of its proper divisors (430351314913).

2151521615615 is an equidigital number, since it uses as much as digits as its factorization.

2151521615615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7831969.

The product of its digits is 90000, while the sum is 41.

The spelling of 2151521615615 in words is "two trillion, one hundred fifty-one billion, five hundred twenty-one million, six hundred fifteen thousand, six hundred fifteen".