77857186233172 has 12 divisors (see below), whose sum is σ = 136337809386996. Its totient is φ = 38903526408320.

The previous prime is 77857186233137. The next prime is 77857186233187. The reversal of 77857186233172 is 27133268175877.

It can be written as a sum of positive squares in 2 ways, for example, as 39923240058256 + 37933946174916 = 6318484^2 + 6159054^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77857186233098 and 77857186233107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6266670079 + ... + 6266682502.

It is an arithmetic number, because the mean of its divisors is an integer number (11361484115583).

Almost surely, 2^{77857186233172} is an apocalyptic number.

It is an amenable number.

77857186233172 is a deficient number, since it is larger than the sum of its proper divisors (58480623153824).

77857186233172 is a wasteful number, since it uses less digits than its factorization.

77857186233172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12533354138 (or 12533354136 counting only the distinct ones).

The product of its digits is 165957120, while the sum is 67.

The spelling of 77857186233172 in words is "seventy-seven trillion, eight hundred fifty-seven billion, one hundred eighty-six million, two hundred thirty-three thousand, one hundred seventy-two".