63475855857397 has 2 divisors, whose sum is σ = 63475855857398. Its totient is φ = 63475855857396.

The previous prime is 63475855857373. The next prime is 63475855857481. The reversal of 63475855857397 is 79375855857436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45568858721841 + 17906997135556 = 6750471^2 + 4231666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63475855857397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63475855857397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63475855857097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31737927928698 + 31737927928699.

It is an arithmetic number, because the mean of its divisors is an integer number (31737927928699).

Almost surely, 2^{63475855857397} is an apocalyptic number.

It is an amenable number.

63475855857397 is a deficient number, since it is larger than the sum of its proper divisors (1).

63475855857397 is an equidigital number, since it uses as much as digits as its factorization.

63475855857397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26671680000, while the sum is 82.

The spelling of 63475855857397 in words is "sixty-three trillion, four hundred seventy-five billion, eight hundred fifty-five million, eight hundred fifty-seven thousand, three hundred ninety-seven".