997978703401 has 4 divisors (see below), whose sum is σ = 1003554003600. Its totient is φ = 992403403204.

The previous prime is 997978703399. The next prime is 997978703413. The reversal of 997978703401 is 104307879799.

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: 104307879799 = 97 ⋅1075338967.

It is a cyclic number.

It is not a de Polignac number, because 997978703401 - 2¹ = 997978703399 is a prime.

It is a super-2 number, since 2×997978703401² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997978700401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2787649831 + ... + 2787650188.

It is an arithmetic number, because the mean of its divisors is an integer number (250888500900).

Almost surely, 2^997978703401 is an apocalyptic number.

It is an amenable number.

997978703401 is a deficient number, since it is larger than the sum of its proper divisors (5575300199).

997978703401 is a wasteful number, since it uses less digits than its factorization.

997978703401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5575300198.

The product of its (nonzero) digits is 24004512, while the sum is 64.

The spelling of 997978703401 in words is "nine hundred ninety-seven billion, nine hundred seventy-eight million, seven hundred three thousand, four hundred one".