9966257437 has 4 divisors (see below), whose sum is σ = 10115007616. Its totient is φ = 9817507260.

The previous prime is 9966257423. The next prime is 9966257461. The reversal of 9966257437 is 7347526699.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9966257437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966257407) 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, 74374989 + ... + 74375122.

It is an arithmetic number, because the mean of its divisors is an integer number (2528751904).

Almost surely, 2^9966257437 is an apocalyptic number.

It is an amenable number.

9966257437 is a deficient number, since it is larger than the sum of its proper divisors (148750179).

9966257437 is a wasteful number, since it uses less digits than its factorization.

9966257437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148750178.

The product of its digits is 17146080, while the sum is 58.

The square root of 9966257437 is about 99831.1446243105. The cubic root of 9966257437 is about 2152.0087544644.

The spelling of 9966257437 in words is "nine billion, nine hundred sixty-six million, two hundred fifty-seven thousand, four hundred thirty-seven".