997455943249 has 4 divisors (see below), whose sum is σ = 1020652593136. Its totient is φ = 974259293364.

The previous prime is 997455943243. The next prime is 997455943259. The reversal of 997455943249 is 942349554799.

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, and also an emirpimes, since its reverse is a distinct semiprime: 942349554799 = 3343 ⋅281887393.

It is a cyclic number.

It is not a de Polignac number, because 997455943249 - 2²¹ = 997453846097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997455943243) 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, 11598324879 + ... + 11598324964.

It is an arithmetic number, because the mean of its divisors is an integer number (255163148284).

Almost surely, 2^997455943249 is an apocalyptic number.

It is an amenable number.

997455943249 is a deficient number, since it is larger than the sum of its proper divisors (23196649887).

997455943249 is a wasteful number, since it uses less digits than its factorization.

997455943249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23196649886.

The product of its digits is 440899200, while the sum is 70.

The spelling of 997455943249 in words is "nine hundred ninety-seven billion, four hundred fifty-five million, nine hundred forty-three thousand, two hundred forty-nine".