42437399509 has 2 divisors, whose sum is σ = 42437399510. Its totient is φ = 42437399508.

The previous prime is 42437399423. The next prime is 42437399527. The reversal of 42437399509 is 90599373424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32796123409 + 9641276100 = 181097^2 + 98190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42437399509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42437399509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42437399909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21218699754 + 21218699755.

It is an arithmetic number, because the mean of its divisors is an integer number (21218699755).

Almost surely, 2^42437399509 is an apocalyptic number.

It is an amenable number.

42437399509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42437399509 is an equidigital number, since it uses as much as digits as its factorization.

42437399509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 42437399509 in words is "forty-two billion, four hundred thirty-seven million, three hundred ninety-nine thousand, five hundred nine".