395399778623 has 2 divisors, whose sum is σ = 395399778624. Its totient is φ = 395399778622.

The previous prime is 395399778481. The next prime is 395399778643. The reversal of 395399778623 is 326877993593.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 395399778623 - 2¹⁴ = 395399762239 is a prime.

It is a super-2 number, since 2×395399778623² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395399778643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197699889311 + 197699889312.

It is an arithmetic number, because the mean of its divisors is an integer number (197699889312).

Almost surely, 2^395399778623 is an apocalyptic number.

395399778623 is a deficient number, since it is larger than the sum of its proper divisors (1).

395399778623 is an equidigital number, since it uses as much as digits as its factorization.

395399778623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 462944160, while the sum is 71.

The spelling of 395399778623 in words is "three hundred ninety-five billion, three hundred ninety-nine million, seven hundred seventy-eight thousand, six hundred twenty-three".