720145537 has 2 divisors, whose sum is σ = 720145538. Its totient is φ = 720145536.

The previous prime is 720145529. The next prime is 720145579. The reversal of 720145537 is 735541027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649434256 + 70711281 = 25484^2 + 8409^2 .

It is a cyclic number.

It is not a de Polignac number, because 720145537 - 2³ = 720145529 is a prime.

It is a super-2 number, since 2×720145537² = 1037219188922036738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (720145507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360072768 + 360072769.

It is an arithmetic number, because the mean of its divisors is an integer number (360072769).

Almost surely, 2^720145537 is an apocalyptic number.

It is an amenable number.

720145537 is a deficient number, since it is larger than the sum of its proper divisors (1).

720145537 is an equidigital number, since it uses as much as digits as its factorization.

720145537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 720145537 is about 26835.5275148449. The cubic root of 720145537 is about 896.3413350765.

The spelling of 720145537 in words is "seven hundred twenty million, one hundred forty-five thousand, five hundred thirty-seven".