1051720520705 has 16 divisors (see below), whose sum is σ = 1263330836544. Its totient is φ = 840532714560.

The previous prime is 1051720520597. The next prime is 1051720520729. The reversal of 1051720520705 is 5070250271501.

It is not a de Polignac number, because 1051720520705 - 2³² = 1047425553409 is a prime.

It is a super-2 number, since 2×1051720520705² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20669195 + ... + 20720015.

It is an arithmetic number, because the mean of its divisors is an integer number (78958177284).

Almost surely, 2^{1051720520705} is an apocalyptic number.

It is an amenable number.

1051720520705 is a deficient number, since it is larger than the sum of its proper divisors (211610315839).

1051720520705 is a wasteful number, since it uses less digits than its factorization.

1051720520705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54896.

The product of its (nonzero) digits is 24500, while the sum is 35.

The spelling of 1051720520705 in words is "one trillion, fifty-one billion, seven hundred twenty million, five hundred twenty thousand, seven hundred five".