380427886661 has 2 divisors, whose sum is σ = 380427886662. Its totient is φ = 380427886660.

The previous prime is 380427886627. The next prime is 380427886759. The reversal of 380427886661 is 166688724083.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225482522500 + 154945364161 = 474850^2 + 393631^2 .

It is a cyclic number.

It is not a de Polignac number, because 380427886661 - 2¹⁸ = 380427624517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 380427886661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (380427886261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190213943330 + 190213943331.

It is an arithmetic number, because the mean of its divisors is an integer number (190213943331).

Almost surely, 2^380427886661 is an apocalyptic number.

It is an amenable number.

380427886661 is a deficient number, since it is larger than the sum of its proper divisors (1).

380427886661 is an equidigital number, since it uses as much as digits as its factorization.

380427886661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18579456, while the sum is 59.

The spelling of 380427886661 in words is "three hundred eighty billion, four hundred twenty-seven million, eight hundred eighty-six thousand, six hundred sixty-one".