3680786375821 has 2 divisors, whose sum is σ = 3680786375822. Its totient is φ = 3680786375820.

The previous prime is 3680786375771. The next prime is 3680786375831. The reversal of 3680786375821 is 1285736870863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2031796518921 + 1648989856900 = 1425411^2 + 1284130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3680786375821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3680786375831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1840393187910 + 1840393187911.

It is an arithmetic number, because the mean of its divisors is an integer number (1840393187911).

Almost surely, 2^{3680786375821} is an apocalyptic number.

It is an amenable number.

3680786375821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3680786375821 is an equidigital number, since it uses as much as digits as its factorization.

3680786375821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 64.

The spelling of 3680786375821 in words is "three trillion, six hundred eighty billion, seven hundred eighty-six million, three hundred seventy-five thousand, eight hundred twenty-one".