78506554429 has 4 divisors (see below), whose sum is σ = 78512286460. Its totient is φ = 78500822400.

The previous prime is 78506554417. The next prime is 78506554433. The reversal of 78506554429 is 92445560587.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46384236900 + 32122317529 = 215370^2 + 179227^2 .

It is a cyclic number.

It is not a de Polignac number, because 78506554429 - 2¹⁷ = 78506423357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78506554429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78506554409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2845422 + ... + 2872879.

It is an arithmetic number, because the mean of its divisors is an integer number (19628071615).

Almost surely, 2^78506554429 is an apocalyptic number.

It is an amenable number.

78506554429 is a deficient number, since it is larger than the sum of its proper divisors (5732031).

78506554429 is a wasteful number, since it uses less digits than its factorization.

78506554429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732030.

The product of its (nonzero) digits is 12096000, while the sum is 55.

The spelling of 78506554429 in words is "seventy-eight billion, five hundred six million, five hundred fifty-four thousand, four hundred twenty-nine".