997008391761 has 8 divisors (see below), whose sum is σ = 1329461659680. Its totient is φ = 664613692512.

The previous prime is 997008391747. The next prime is 997008391801. The reversal of 997008391761 is 167193800799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997008391761 - 2¹⁰ = 997008390737 is a prime.

It is a super-2 number, since 2×997008391761² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 997008391695 and 997008391704.

It is not an unprimeable number, because it can be changed into a prime (997008391261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14602431 + ... + 14670548.

It is an arithmetic number, because the mean of its divisors is an integer number (166182707460).

Almost surely, 2^997008391761 is an apocalyptic number.

It is an amenable number.

997008391761 is a deficient number, since it is larger than the sum of its proper divisors (332453267919).

997008391761 is a wasteful number, since it uses less digits than its factorization.

997008391761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29284335.

The product of its (nonzero) digits is 5143824, while the sum is 60.

The spelling of 997008391761 in words is "nine hundred ninety-seven billion, eight million, three hundred ninety-one thousand, seven hundred sixty-one".