78780121501634 has 48 divisors (see below), whose sum is σ = 137845360800576. Its totient is φ = 33669080978400.

The previous prime is 78780121501633. The next prime is 78780121501637. The reversal of 78780121501634 is 43610512108787.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78780121501633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391429289 + ... + 391630499.

It is an arithmetic number, because the mean of its divisors is an integer number (2871778350012).

Almost surely, 2^{78780121501634} is an apocalyptic number.

78780121501634 is a deficient number, since it is larger than the sum of its proper divisors (59065239298942).

78780121501634 is a wasteful number, since it uses less digits than its factorization.

78780121501634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212311 (or 212304 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 78780121501634 in words is "seventy-eight trillion, seven hundred eighty billion, one hundred twenty-one million, five hundred one thousand, six hundred thirty-four".