20078597197 has 2 divisors, whose sum is σ = 20078597198. Its totient is φ = 20078597196.

The previous prime is 20078597183. The next prime is 20078597219. The reversal of 20078597197 is 79179587002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19875078441 + 203518756 = 140979^2 + 14266^2 .

It is a cyclic number.

It is not a de Polignac number, because 20078597197 - 2³¹ = 17931113549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20078597137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10039298598 + 10039298599.

It is an arithmetic number, because the mean of its divisors is an integer number (10039298599).

Almost surely, 2^20078597197 is an apocalyptic number.

It is an amenable number.

20078597197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20078597197 is an equidigital number, since it uses as much as digits as its factorization.

20078597197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 55.

The spelling of 20078597197 in words is "twenty billion, seventy-eight million, five hundred ninety-seven thousand, one hundred ninety-seven".