197631478077 has 16 divisors (see below), whose sum is σ = 287534638080. Its totient is φ = 119747207600.

The previous prime is 197631478019. The next prime is 197631478111. The reversal of 197631478077 is 770874136791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 197631478077 - 2¹⁸ = 197631215933 is a prime.

It is a super-2 number, since 2×197631478077² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197631478077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197631474077) 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, 599499 + ... + 868712.

It is an arithmetic number, because the mean of its divisors is an integer number (17970914880).

Almost surely, 2^197631478077 is an apocalyptic number.

It is an amenable number.

197631478077 is a deficient number, since it is larger than the sum of its proper divisors (89903160003).

197631478077 is a wasteful number, since it uses less digits than its factorization.

197631478077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472304.

The product of its (nonzero) digits is 12446784, while the sum is 60.

The spelling of 197631478077 in words is "one hundred ninety-seven billion, six hundred thirty-one million, four hundred seventy-eight thousand, seventy-seven".