77775387212 has 12 divisors (see below), whose sum is σ = 136477793760. Its totient is φ = 38781731856.

The previous prime is 77775387197. The next prime is 77775387247. The reversal of 77775387212 is 21278357777.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26488787 + ... + 26491722.

It is an arithmetic number, because the mean of its divisors is an integer number (11373149480).

Almost surely, 2^77775387212 is an apocalyptic number.

It is an amenable number.

77775387212 is a deficient number, since it is larger than the sum of its proper divisors (58702406548).

77775387212 is a wasteful number, since it uses less digits than its factorization.

77775387212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52980880 (or 52980878 counting only the distinct ones).

The product of its digits is 8067360, while the sum is 56.

The spelling of 77775387212 in words is "seventy-seven billion, seven hundred seventy-five million, three hundred eighty-seven thousand, two hundred twelve".