521860061364137 has 8 divisors (see below), whose sum is σ = 522714556503720. Its totient is φ = 521006160660480.

The previous prime is 521860061364067. The next prime is 521860061364151. The reversal of 521860061364137 is 731463160068125.

It can be written as a sum of positive squares in 4 ways, for example, as 14416138265881 + 507443923098256 = 3796859^2 + 22526516^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 521860061364137 - 2¹⁴ = 521860061347753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521860061304137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146851712 + ... + 150363377.

It is an arithmetic number, because the mean of its divisors is an integer number (65339319562965).

Almost surely, 2^{521860061364137} is an apocalyptic number.

It is an amenable number.

521860061364137 is a deficient number, since it is larger than the sum of its proper divisors (854495139583).

521860061364137 is a wasteful number, since it uses less digits than its factorization.

521860061364137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297217963.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 521860061364137 in words is "five hundred twenty-one trillion, eight hundred sixty billion, sixty-one million, three hundred sixty-four thousand, one hundred thirty-seven".