7771557157 has 16 divisors (see below), whose sum is σ = 10127642112. Its totient is φ = 5787221760.

The previous prime is 7771557103. The next prime is 7771557179. The reversal of 7771557157 is 7517551777.

It is a cyclic number.

It is not a de Polignac number, because 7771557157 - 2¹¹ = 7771555109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771557187) 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 15 ways as a sum of consecutive naturals, for example, 2510269 + ... + 2513362.

It is an arithmetic number, because the mean of its divisors is an integer number (632977632).

Almost surely, 2^7771557157 is an apocalyptic number.

It is an amenable number.

7771557157 is a deficient number, since it is larger than the sum of its proper divisors (2356084955).

7771557157 is a wasteful number, since it uses less digits than its factorization.

7771557157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023668.

The product of its digits is 2100875, while the sum is 52.

The square root of 7771557157 is about 88156.4357094818. The cubic root of 7771557157 is about 1980.7789640704.

The spelling of 7771557157 in words is "seven billion, seven hundred seventy-one million, five hundred fifty-seven thousand, one hundred fifty-seven".