77287855197 has 32 divisors (see below), whose sum is σ = 120313442304. Its totient is φ = 43211995200.

The previous prime is 77287855181. The next prime is 77287855217. The reversal of 77287855197 is 79155878277.

It is not a de Polignac number, because 77287855197 - 2⁴ = 77287855181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77287855297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4028247 + ... + 4047387.

It is an arithmetic number, because the mean of its divisors is an integer number (3759795072).

Almost surely, 2^77287855197 is an apocalyptic number.

It is an amenable number.

77287855197 is a deficient number, since it is larger than the sum of its proper divisors (43025587107).

77287855197 is a wasteful number, since it uses less digits than its factorization.

77287855197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23289.

The product of its digits is 69148800, while the sum is 66.

The spelling of 77287855197 in words is "seventy-seven billion, two hundred eighty-seven million, eight hundred fifty-five thousand, one hundred ninety-seven".