7257720551 has 2 divisors, whose sum is σ = 7257720552. Its totient is φ = 7257720550.

The previous prime is 7257720539. The next prime is 7257720571. The reversal of 7257720551 is 1550277527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7257720551 - 2³⁰ = 6183978727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7257720499 and 7257720508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7257720511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3628860275 + 3628860276.

It is an arithmetic number, because the mean of its divisors is an integer number (3628860276).

Almost surely, 2^7257720551 is an apocalyptic number.

7257720551 is a deficient number, since it is larger than the sum of its proper divisors (1).

7257720551 is an equidigital number, since it uses as much as digits as its factorization.

7257720551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 171500, while the sum is 41.

The square root of 7257720551 is about 85192.2564027975. The cubic root of 7257720551 is about 1936.1250949913.

The spelling of 7257720551 in words is "seven billion, two hundred fifty-seven million, seven hundred twenty thousand, five hundred fifty-one".