77206005505505 has 16 divisors (see below), whose sum is σ = 93565878042000. Its totient is φ = 61155337063680.

The previous prime is 77206005505459. The next prime is 77206005505513. The reversal of 77206005505505 is 50550550060277.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 16190910106849 + 61015095398656 = 4023793^2 + 7811216^2 .

It is not a de Polignac number, because 77206005505505 - 2¹⁸ = 77206005243361 is a prime.

It is a super-2 number, since 2×77206005505505² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77206005505505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186060230 + ... + 186474719.

It is an arithmetic number, because the mean of its divisors is an integer number (5847867377625).

Almost surely, 2^{77206005505505} is an apocalyptic number.

It is an amenable number.

77206005505505 is a deficient number, since it is larger than the sum of its proper divisors (16359872536495).

77206005505505 is a wasteful number, since it uses less digits than its factorization.

77206005505505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372535364.

The product of its (nonzero) digits is 1837500, while the sum is 47.

The spelling of 77206005505505 in words is "seventy-seven trillion, two hundred six billion, five million, five hundred five thousand, five hundred five".