78666734553 has 8 divisors (see below), whose sum is σ = 114424341216. Its totient is φ = 47676808800.

The previous prime is 78666734527. The next prime is 78666734579. The reversal of 78666734553 is 35543766687.

It is an interprime number because it is at equal distance from previous prime (78666734527) and next prime (78666734579).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78666734553 - 2³² = 74371767257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78666734513) 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 in 7 ways as a sum of consecutive naturals, for example, 1191920188 + ... + 1191920253.

It is an arithmetic number, because the mean of its divisors is an integer number (14303042652).

Almost surely, 2^78666734553 is an apocalyptic number.

It is an amenable number.

78666734553 is a deficient number, since it is larger than the sum of its proper divisors (35757606663).

78666734553 is a wasteful number, since it uses less digits than its factorization.

78666734553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383840455.

The product of its digits is 76204800, while the sum is 60.

The spelling of 78666734553 in words is "seventy-eight billion, six hundred sixty-six million, seven hundred thirty-four thousand, five hundred fifty-three".