78774030666502 has 4 divisors (see below), whose sum is σ = 118161045999756. Its totient is φ = 39387015333250.

The previous prime is 78774030666497. The next prime is 78774030666503. The reversal of 78774030666502 is 20566603047787.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78774030666503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19693507666624 + ... + 19693507666627.

It is an arithmetic number, because the mean of its divisors is an integer number (29540261499939).

Almost surely, 2^{78774030666502} is an apocalyptic number.

78774030666502 is a deficient number, since it is larger than the sum of its proper divisors (39387015333254).

78774030666502 is a wasteful number, since it uses less digits than its factorization.

78774030666502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39387015333253.

The product of its (nonzero) digits is 71124480, while the sum is 61.

The spelling of 78774030666502 in words is "seventy-eight trillion, seven hundred seventy-four billion, thirty million, six hundred sixty-six thousand, five hundred two".