1640816077 has 2 divisors, whose sum is σ = 1640816078. Its totient is φ = 1640816076.

The previous prime is 1640816071. The next prime is 1640816087. The reversal of 1640816077 is 7706180461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572439716 + 68376361 = 39654^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640816077 - 2¹¹ = 1640814029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640816071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820408038 + 820408039.

It is an arithmetic number, because the mean of its divisors is an integer number (820408039).

Almost surely, 2^1640816077 is an apocalyptic number.

It is an amenable number.

1640816077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640816077 is an equidigital number, since it uses as much as digits as its factorization.

1640816077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1640816077 is about 40506.9880020719. The cubic root of 1640816077 is about 1179.4692808731.

The spelling of 1640816077 in words is "one billion, six hundred forty million, eight hundred sixteen thousand, seventy-seven".