10520720551 has 4 divisors (see below), whose sum is σ = 11477149704. Its totient is φ = 9564291400.

The previous prime is 10520720549. The next prime is 10520720579. The reversal of 10520720551 is 15502702501.

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 10520720551 - 2¹ = 10520720549 is a prime.

It is a super-2 number, since 2×10520720551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10520720501) 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, 478214560 + ... + 478214581.

It is an arithmetic number, because the mean of its divisors is an integer number (2869287426).

Almost surely, 2^10520720551 is an apocalyptic number.

10520720551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10520720551 is a deficient number, since it is larger than the sum of its proper divisors (956429153).

10520720551 is an equidigital number, since it uses as much as digits as its factorization.

10520720551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956429152.

The product of its (nonzero) digits is 3500, while the sum is 28.

The spelling of 10520720551 in words is "ten billion, five hundred twenty million, seven hundred twenty thousand, five hundred fifty-one".