397788664791 has 32 divisors (see below), whose sum is σ = 645898337280. Its totient is φ = 212574076416.

The previous prime is 397788664771. The next prime is 397788664799. The reversal of 397788664791 is 197466887793.

It is not a de Polignac number, because 397788664791 - 2¹⁸ = 397788402647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397788664799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3492531 + ... + 3604628.

It is an arithmetic number, because the mean of its divisors is an integer number (20184323040).

Almost surely, 2^397788664791 is an apocalyptic number.

397788664791 is a deficient number, since it is larger than the sum of its proper divisors (248109672489).

397788664791 is a wasteful number, since it uses less digits than its factorization.

397788664791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7097343.

The product of its digits is 768144384, while the sum is 75.

The spelling of 397788664791 in words is "three hundred ninety-seven billion, seven hundred eighty-eight million, six hundred sixty-four thousand, seven hundred ninety-one".