197561350639 has 2 divisors, whose sum is σ = 197561350640. Its totient is φ = 197561350638.

The previous prime is 197561350627. The next prime is 197561350661. The reversal of 197561350639 is 936053165791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197561350639 - 2¹⁵ = 197561317871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197561350639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197561350439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98780675319 + 98780675320.

It is an arithmetic number, because the mean of its divisors is an integer number (98780675320).

Almost surely, 2^197561350639 is an apocalyptic number.

197561350639 is a deficient number, since it is larger than the sum of its proper divisors (1).

197561350639 is an equidigital number, since it uses as much as digits as its factorization.

197561350639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4592700, while the sum is 55.

The spelling of 197561350639 in words is "one hundred ninety-seven billion, five hundred sixty-one million, three hundred fifty thousand, six hundred thirty-nine".