77066542549 has 4 divisors (see below), whose sum is σ = 77185656864. Its totient is φ = 76947428236.

The previous prime is 77066542519. The next prime is 77066542627. The reversal of 77066542549 is 94524566077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94524566077 = 114311 ⋅826907.

It is a cyclic number.

It is not a de Polignac number, because 77066542549 - 2¹³ = 77066534357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77066542549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77066542519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59556187 + ... + 59557480.

It is an arithmetic number, because the mean of its divisors is an integer number (19296414216).

Almost surely, 2^77066542549 is an apocalyptic number.

It is an amenable number.

77066542549 is a deficient number, since it is larger than the sum of its proper divisors (119114315).

77066542549 is a wasteful number, since it uses less digits than its factorization.

77066542549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119114314.

The product of its (nonzero) digits is 12700800, while the sum is 55.

The spelling of 77066542549 in words is "seventy-seven billion, sixty-six million, five hundred forty-two thousand, five hundred forty-nine".