65720437 has 2 divisors, whose sum is σ = 65720438. Its totient is φ = 65720436.

The previous prime is 65720423. The next prime is 65720441. The reversal of 65720437 is 73402756.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55741156 + 9979281 = 7466^2 + 3159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65720437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65720737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32860218 + 32860219.

It is an arithmetic number, because the mean of its divisors is an integer number (32860219).

Almost surely, 2^65720437 is an apocalyptic number.

It is an amenable number.

65720437 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720437 is an equidigital number, since it uses as much as digits as its factorization.

65720437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 65720437 is about 8106.8142324837. The cubic root of 65720437 is about 403.5525979586.

The spelling of 65720437 in words is "sixty-five million, seven hundred twenty thousand, four hundred thirty-seven".