420157877778 has 24 divisors (see below), whose sum is σ = 941733175500. Its totient is φ = 135223224864.

The previous prime is 420157877773. The next prime is 420157877779. The reversal of 420157877778 is 877778751024.

420157877778 is a `hidden beast` number, since 420 + 1 + 5 + 78 + 7 + 77 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 416640557529 + 3517320249 = 645477^2 + 59307^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (420157877773) 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 11 ways as a sum of consecutive naturals, for example, 402449553 + ... + 402450596.

Almost surely, 2^420157877778 is an apocalyptic number.

420157877778 is an abundant number, since it is smaller than the sum of its proper divisors (521575297722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420157877778 is a wasteful number, since it uses less digits than its factorization.

420157877778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804900186 (or 804900183 counting only the distinct ones).

The product of its (nonzero) digits is 43025920, while the sum is 63.

The spelling of 420157877778 in words is "four hundred twenty billion, one hundred fifty-seven million, eight hundred seventy-seven thousand, seven hundred seventy-eight".