194612821757 has 2 divisors, whose sum is σ = 194612821758. Its totient is φ = 194612821756.

The previous prime is 194612821723. The next prime is 194612821763. The reversal of 194612821757 is 757128216491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175545078361 + 19067743396 = 418981^2 + 138086^2 .

It is a cyclic number.

It is not a de Polignac number, because 194612821757 - 2⁶ = 194612821693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194612821699 and 194612821708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194612821717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97306410878 + 97306410879.

It is an arithmetic number, because the mean of its divisors is an integer number (97306410879).

Almost surely, 2^194612821757 is an apocalyptic number.

It is an amenable number.

194612821757 is a deficient number, since it is larger than the sum of its proper divisors (1).

194612821757 is an equidigital number, since it uses as much as digits as its factorization.

194612821757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The spelling of 194612821757 in words is "one hundred ninety-four billion, six hundred twelve million, eight hundred twenty-one thousand, seven hundred fifty-seven".