42778145557 has 4 divisors (see below), whose sum is σ = 48889309216. Its totient is φ = 36666981900.

The previous prime is 42778145519. The next prime is 42778145573. The reversal of 42778145557 is 75554187724.

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.

It is a cyclic number.

It is not a de Polignac number, because 42778145557 - 2³¹ = 40630661909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42778145498 and 42778145507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778145057) 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, 3055581819 + ... + 3055581832.

It is an arithmetic number, because the mean of its divisors is an integer number (12222327304).

Almost surely, 2^42778145557 is an apocalyptic number.

It is an amenable number.

42778145557 is a deficient number, since it is larger than the sum of its proper divisors (6111163659).

42778145557 is an equidigital number, since it uses as much as digits as its factorization.

42778145557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111163658.

The product of its digits is 10976000, while the sum is 55.

The spelling of 42778145557 in words is "forty-two billion, seven hundred seventy-eight million, one hundred forty-five thousand, five hundred fifty-seven".