997956320487 has 16 divisors (see below), whose sum is σ = 1520817430272. Its totient is φ = 570214972800.

The previous prime is 997956320483. The next prime is 997956320527. The reversal of 997956320487 is 784023659799.

It is not a de Polignac number, because 997956320487 - 2² = 997956320483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997956320483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638889 + ... + 2163762.

It is an arithmetic number, because the mean of its divisors is an integer number (95051089392).

Almost surely, 2^997956320487 is an apocalyptic number.

997956320487 is a deficient number, since it is larger than the sum of its proper divisors (522861109785).

997956320487 is a wasteful number, since it uses less digits than its factorization.

997956320487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815158.

The product of its (nonzero) digits is 205752960, while the sum is 69.

The spelling of 997956320487 in words is "nine hundred ninety-seven billion, nine hundred fifty-six million, three hundred twenty thousand, four hundred eighty-seven".