321615414706451 has 4 divisors (see below), whose sum is σ = 322012961573400. Its totient is φ = 321217867839504.

The previous prime is 321615414706433. The next prime is 321615414706459. The reversal of 321615414706451 is 154607414516123.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 321615414706451 - 2¹⁰ = 321615414705427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321615414706451.

It is not an unprimeable number, because it can be changed into a prime (321615414706459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198773432261 + ... + 198773433878.

It is an arithmetic number, because the mean of its divisors is an integer number (80503240393350).

Almost surely, 2^{321615414706451} is an apocalyptic number.

321615414706451 is a deficient number, since it is larger than the sum of its proper divisors (397546866949).

321615414706451 is an equidigital number, since it uses as much as digits as its factorization.

321615414706451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397546866948.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 321615414706451 in words is "three hundred twenty-one trillion, six hundred fifteen billion, four hundred fourteen million, seven hundred six thousand, four hundred fifty-one".