197655857039 has 2 divisors, whose sum is σ = 197655857040. Its totient is φ = 197655857038.

The previous prime is 197655856973. The next prime is 197655857041. The reversal of 197655857039 is 930758556791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197655857039 is a prime.

Together with 197655857041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197655857099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98827928519 + 98827928520.

It is an arithmetic number, because the mean of its divisors is an integer number (98827928520).

Almost surely, 2^197655857039 is an apocalyptic number.

197655857039 is a deficient number, since it is larger than the sum of its proper divisors (1).

197655857039 is an equidigital number, since it uses as much as digits as its factorization.

197655857039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442000, while the sum is 65.

The spelling of 197655857039 in words is "one hundred ninety-seven billion, six hundred fifty-five million, eight hundred fifty-seven thousand, thirty-nine".