77606449869 has 32 divisors (see below), whose sum is σ = 113786515584. Its totient is φ = 46759541760.

The previous prime is 77606449861. The next prime is 77606449871. The reversal of 77606449869 is 96894460677.

It is a happy number.

It is not a de Polignac number, because 77606449869 - 2³ = 77606449861 is a prime.

It is a super-2 number, since 2×77606449869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77606449861) 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 31 ways as a sum of consecutive naturals, for example, 290554 + ... + 489524.

It is an arithmetic number, because the mean of its divisors is an integer number (3555828612).

Almost surely, 2^77606449869 is an apocalyptic number.

It is an amenable number.

77606449869 is a deficient number, since it is larger than the sum of its proper divisors (36180065715).

77606449869 is a wasteful number, since it uses less digits than its factorization.

77606449869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199197.

The product of its (nonzero) digits is 109734912, while the sum is 66.

The spelling of 77606449869 in words is "seventy-seven billion, six hundred six million, four hundred forty-nine thousand, eight hundred sixty-nine".