997185982465 has 4 divisors (see below), whose sum is σ = 1196623178964. Its totient is φ = 797748785968.

The previous prime is 997185982451. The next prime is 997185982477. The reversal of 997185982465 is 564289581799.

It is a Cunningham number, because it is equal to 998592²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564289581799 = 53657 ⋅10516607.

It can be written as a sum of positive squares in 2 ways, for example, as 358987912336 + 638198070129 = 599156^2 + 798873^2 .

It is a cyclic number.

It is not a de Polignac number, because 997185982465 - 2⁵ = 997185982433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99718598242 + ... + 99718598251.

It is an arithmetic number, because the mean of its divisors is an integer number (299155794741).

Almost surely, 2^997185982465 is an apocalyptic number.

It is an amenable number.

997185982465 is a deficient number, since it is larger than the sum of its proper divisors (199437196499).

997185982465 is a wasteful number, since it uses less digits than its factorization.

997185982465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199437196498.

The product of its digits is 391910400, while the sum is 73.

The spelling of 997185982465 in words is "nine hundred ninety-seven billion, one hundred eighty-five million, nine hundred eighty-two thousand, four hundred sixty-five".