77371554649 has 16 divisors (see below), whose sum is σ = 79626000384. Its totient is φ = 75135427200.

The previous prime is 77371554643. The next prime is 77371554727. The reversal of 77371554649 is 94645517377.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 77371554649 - 2²⁷ = 77237336921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77371554593 and 77371554602.

It is not an unprimeable number, because it can be changed into a prime (77371554643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8207959 + ... + 8217379.

It is an arithmetic number, because the mean of its divisors is an integer number (4976625024).

Almost surely, 2^77371554649 is an apocalyptic number.

It is an amenable number.

77371554649 is a deficient number, since it is larger than the sum of its proper divisors (2254445735).

77371554649 is a wasteful number, since it uses less digits than its factorization.

77371554649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10368.

The product of its digits is 22226400, while the sum is 58.

The spelling of 77371554649 in words is "seventy-seven billion, three hundred seventy-one million, five hundred fifty-four thousand, six hundred forty-nine".