997173539078 has 16 divisors (see below), whose sum is σ = 1520327308896. Its totient is φ = 490398267840.

The previous prime is 997173539057. The next prime is 997173539083. The reversal of 997173539078 is 870935371799.

It is a junction number, because it is equal to n+sod(n) for n = 997173538999 and 997173539017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4637375 + ... + 4847637.

It is an arithmetic number, because the mean of its divisors is an integer number (95020456806).

Almost surely, 2^997173539078 is an apocalyptic number.

997173539078 is a deficient number, since it is larger than the sum of its proper divisors (523153769818).

997173539078 is a wasteful number, since it uses less digits than its factorization.

997173539078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249199.

The product of its (nonzero) digits is 90016920, while the sum is 68.

The spelling of 997173539078 in words is "nine hundred ninety-seven billion, one hundred seventy-three million, five hundred thirty-nine thousand, seventy-eight".