35780316821 has 2 divisors, whose sum is σ = 35780316822. Its totient is φ = 35780316820.

The previous prime is 35780316809. The next prime is 35780316829. The reversal of 35780316821 is 12861308753.

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., 24054459025 + 11725857796 = 155095^2 + 108286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-35780316821 is a prime.

It is a super-2 number, since 2×35780316821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35780316829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17890158410 + 17890158411.

It is an arithmetic number, because the mean of its divisors is an integer number (17890158411).

Almost surely, 2^35780316821 is an apocalyptic number.

It is an amenable number.

35780316821 is a deficient number, since it is larger than the sum of its proper divisors (1).

35780316821 is an equidigital number, since it uses as much as digits as its factorization.

35780316821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 35780316821 in words is "thirty-five billion, seven hundred eighty million, three hundred sixteen thousand, eight hundred twenty-one".