997578663764 has 6 divisors (see below), whose sum is σ = 1745762661594. Its totient is φ = 498789331880.

The previous prime is 997578663749. The next prime is 997578663793. The reversal of 997578663764 is 467366875799.

It can be written as a sum of positive squares in only one way, i.e., 534811390864 + 462767272900 = 731308^2 + 680270^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 124697332967 + ... + 124697332974.

It is an arithmetic number, because the mean of its divisors is an integer number (290960443599).

Almost surely, 2^997578663764 is an apocalyptic number.

It is an amenable number.

997578663764 is a deficient number, since it is larger than the sum of its proper divisors (748183997830).

997578663764 is a wasteful number, since it uses less digits than its factorization.

997578663764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249394665945 (or 249394665943 counting only the distinct ones).

The product of its digits is 2880541440, while the sum is 77.

The spelling of 997578663764 in words is "nine hundred ninety-seven billion, five hundred seventy-eight million, six hundred sixty-three thousand, seven hundred sixty-four".