197780440677 has 16 divisors (see below), whose sum is σ = 266645695680. Its totient is φ = 130392547200.

The previous prime is 197780440657. The next prime is 197780440691. The reversal of 197780440677 is 776044087791.

It is not a de Polignac number, because 197780440677 - 2²⁰ = 197779392101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197780440677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197780440657) 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, 920224 + ... + 1114617.

It is an arithmetic number, because the mean of its divisors is an integer number (16665355980).

Almost surely, 2^197780440677 is an apocalyptic number.

It is an amenable number.

197780440677 is a deficient number, since it is larger than the sum of its proper divisors (68865255003).

197780440677 is a wasteful number, since it uses less digits than its factorization.

197780440677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035204.

The product of its (nonzero) digits is 16595712, while the sum is 60.

The spelling of 197780440677 in words is "one hundred ninety-seven billion, seven hundred eighty million, four hundred forty thousand, six hundred seventy-seven".