197631994077 has 24 divisors (see below), whose sum is σ = 326262867840. Its totient is φ = 112927989600.

The previous prime is 197631994057. The next prime is 197631994111. The reversal of 197631994077 is 770499136791.

197631994077 is a `hidden beast` number, since 197 + 6 + 31 + 9 + 9 + 407 + 7 = 666.

197631994077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197631994077 - 2⁸ = 197631993821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197631994037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2062327 + ... + 2156027.

It is an arithmetic number, because the mean of its divisors is an integer number (13594286160).

Almost surely, 2^197631994077 is an apocalyptic number.

It is an amenable number.

197631994077 is a deficient number, since it is larger than the sum of its proper divisors (128630873763).

197631994077 is a wasteful number, since it uses less digits than its factorization.

197631994077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127193 (or 127190 counting only the distinct ones).

The product of its (nonzero) digits is 18003384, while the sum is 63.

The spelling of 197631994077 in words is "one hundred ninety-seven billion, six hundred thirty-one million, nine hundred ninety-four thousand, seventy-seven".