2078755520521 has 9 divisors (see below), whose sum is σ = 2082639729933. Its totient is φ = 2074878549900.

The previous prime is 2078755520441. The next prime is 2078755520591. The reversal of 2078755520521 is 1250255578702.

The square root of 2078755520521 is 1441789.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2078755520521 - 2¹³ = 2078755512329 is a prime.

It is a super-2 number, since 2×2078755520521² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2078755520591) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1065481096 + ... + 1065483046.

It is an arithmetic number, because the mean of its divisors is an integer number (231404414437).

Almost surely, 2^{2078755520521} is an apocalyptic number.

2078755520521 is the 1441789-th square number.

2078755520521 is the 720895-th centered octagonal number.

It is an amenable number.

2078755520521 is a deficient number, since it is larger than the sum of its proper divisors (3884209412).

2078755520521 is an frugal number, since it uses more digits than its factorization.

2078755520521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380 (or 2690 counting only the distinct ones).

The product of its (nonzero) digits is 1960000, while the sum is 49.

Multiplying 2078755520521 by its sum of digits (49), we get a square (101859020505529 = 10092523²).

The spelling of 2078755520521 in words is "two trillion, seventy-eight billion, seven hundred fifty-five million, five hundred twenty thousand, five hundred twenty-one".