52021216615 has 4 divisors (see below), whose sum is σ = 62425459944. Its totient is φ = 41616973288.

The previous prime is 52021216613. The next prime is 52021216657. The reversal of 52021216615 is 51661212025.

52021216615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52021216615 - 2¹ = 52021216613 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52021216613) 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, 5202121657 + ... + 5202121666.

It is an arithmetic number, because the mean of its divisors is an integer number (15606364986).

Almost surely, 2^52021216615 is an apocalyptic number.

52021216615 is a deficient number, since it is larger than the sum of its proper divisors (10404243329).

52021216615 is a wasteful number, since it uses less digits than its factorization.

52021216615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10404243328.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 52021216615 in words is "fifty-two billion, twenty-one million, two hundred sixteen thousand, six hundred fifteen".