77509655540 has 12 divisors (see below), whose sum is σ = 162770276676. Its totient is φ = 31003862208.

The previous prime is 77509655501. The next prime is 77509655557. The reversal of 77509655540 is 4555690577.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38295358864 + 39214296676 = 195692^2 + 198026^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937741369 + ... + 1937741408.

It is an arithmetic number, because the mean of its divisors is an integer number (13564189723).

Almost surely, 2^77509655540 is an apocalyptic number.

It is an amenable number.

77509655540 is an abundant number, since it is smaller than the sum of its proper divisors (85260621136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77509655540 is a wasteful number, since it uses less digits than its factorization.

77509655540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875482786 (or 3875482784 counting only the distinct ones).

The product of its (nonzero) digits is 6615000, while the sum is 53.

The spelling of 77509655540 in words is "seventy-seven billion, five hundred nine million, six hundred fifty-five thousand, five hundred forty".