997790848477 has 2 divisors, whose sum is σ = 997790848478. Its totient is φ = 997790848476.

The previous prime is 997790848471. The next prime is 997790848501. The reversal of 997790848477 is 774848097799.

997790848477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874722490756 + 123068357721 = 935266^2 + 350811^2 .

It is a cyclic number.

It is not a de Polignac number, because 997790848477 - 2¹⁵ = 997790815709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997790848397 and 997790848406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997790848471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498895424238 + 498895424239.

It is an arithmetic number, because the mean of its divisors is an integer number (498895424239).

Almost surely, 2^997790848477 is an apocalyptic number.

It is an amenable number.

997790848477 is a deficient number, since it is larger than the sum of its proper divisors (1).

997790848477 is an equidigital number, since it uses as much as digits as its factorization.

997790848477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792336896, while the sum is 79.

The spelling of 997790848477 in words is "nine hundred ninety-seven billion, seven hundred ninety million, eight hundred forty-eight thousand, four hundred seventy-seven".