78454822357 has 4 divisors (see below), whose sum is σ = 78458498496. Its totient is φ = 78451146220.

The previous prime is 78454822349. The next prime is 78454822421. The reversal of 78454822357 is 75322845487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75322845487 = 367 ⋅205239361.

It is a cyclic number.

It is not a de Polignac number, because 78454822357 - 2³ = 78454822349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78454822298 and 78454822307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78454822307) 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, 1805869 + ... + 1848802.

It is an arithmetic number, because the mean of its divisors is an integer number (19614624624).

Almost surely, 2^78454822357 is an apocalyptic number.

It is an amenable number.

78454822357 is a deficient number, since it is larger than the sum of its proper divisors (3676139).

78454822357 is a wasteful number, since it uses less digits than its factorization.

78454822357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676138.

The product of its digits is 15052800, while the sum is 55.

The spelling of 78454822357 in words is "seventy-eight billion, four hundred fifty-four million, eight hundred twenty-two thousand, three hundred fifty-seven".