77667669949 has 2 divisors, whose sum is σ = 77667669950. Its totient is φ = 77667669948.

The previous prime is 77667669943. The next prime is 77667669953. The reversal of 77667669949 is 94996676677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57963933049 + 19703736900 = 240757^2 + 140370^2 .

It is a cyclic number.

It is not a de Polignac number, because 77667669949 - 2¹¹ = 77667667901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77667669943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38833834974 + 38833834975.

It is an arithmetic number, because the mean of its divisors is an integer number (38833834975).

Almost surely, 2^77667669949 is an apocalyptic number.

It is an amenable number.

77667669949 is a deficient number, since it is larger than the sum of its proper divisors (1).

77667669949 is an equidigital number, since it uses as much as digits as its factorization.

77667669949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296243648, while the sum is 76.

The spelling of 77667669949 in words is "seventy-seven billion, six hundred sixty-seven million, six hundred sixty-nine thousand, nine hundred forty-nine".