1900809697777 has 2 divisors, whose sum is σ = 1900809697778. Its totient is φ = 1900809697776.

The previous prime is 1900809697741. The next prime is 1900809697811. The reversal of 1900809697777 is 7777969080091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 952505729296 + 948303968481 = 975964^2 + 973809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1900809697777 is a prime.

It is a super-2 number, since 2×1900809697777² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1900809697277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950404848888 + 950404848889.

It is an arithmetic number, because the mean of its divisors is an integer number (950404848889).

Almost surely, 2^{1900809697777} is an apocalyptic number.

It is an amenable number.

1900809697777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1900809697777 is an equidigital number, since it uses as much as digits as its factorization.

1900809697777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84015792, while the sum is 70.

The spelling of 1900809697777 in words is "one trillion, nine hundred billion, eight hundred nine million, six hundred ninety-seven thousand, seven hundred seventy-seven".