52121538378815 has 4 divisors (see below), whose sum is σ = 62545846054584. Its totient is φ = 41697230703048.

The previous prime is 52121538378799. The next prime is 52121538378827. The reversal of 52121538378815 is 51887383512125.

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 52121538378815 - 2⁴ = 52121538378799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5212153837877 + ... + 5212153837886.

It is an arithmetic number, because the mean of its divisors is an integer number (15636461513646).

Almost surely, 2^{52121538378815} is an apocalyptic number.

52121538378815 is a deficient number, since it is larger than the sum of its proper divisors (10424307675769).

52121538378815 is a wasteful number, since it uses less digits than its factorization.

52121538378815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10424307675768.

The product of its digits is 16128000, while the sum is 59.

The spelling of 52121538378815 in words is "fifty-two trillion, one hundred twenty-one billion, five hundred thirty-eight million, three hundred seventy-eight thousand, eight hundred fifteen".