77644091029 has 4 divisors (see below), whose sum is σ = 77820957280. Its totient is φ = 77467224780.

The previous prime is 77644091027. The next prime is 77644091051. The reversal of 77644091029 is 92019044677.

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.

It is a cyclic number.

It is not a de Polignac number, because 77644091029 - 2¹ = 77644091027 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77644091027) 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, 88432467 + ... + 88433344.

It is an arithmetic number, because the mean of its divisors is an integer number (19455239320).

Almost surely, 2^77644091029 is an apocalyptic number.

It is an amenable number.

77644091029 is a deficient number, since it is larger than the sum of its proper divisors (176866251).

77644091029 is a wasteful number, since it uses less digits than its factorization.

77644091029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176866250.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 77644091029 in words is "seventy-seven billion, six hundred forty-four million, ninety-one thousand, twenty-nine".