842136420520 has 32 divisors (see below), whose sum is σ = 1895028738120. Its totient is φ = 336815138560.

The previous prime is 842136420493. The next prime is 842136420523. The reversal of 842136420520 is 25024631248.

It can be written as a sum of positive squares in 4 ways, for example, as 587194233796 + 254942186724 = 766286^2 + 504918^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 842136420520.

It is not an unprimeable number, because it can be changed into a prime (842136420523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 884971 + ... + 1570810.

Almost surely, 2^842136420520 is an apocalyptic number.

It is an amenable number.

842136420520 is an abundant number, since it is smaller than the sum of its proper divisors (1052892317600).

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

842136420520 is a wasteful number, since it uses less digits than its factorization.

842136420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464365 (or 2464361 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 842136420520 in words is "eight hundred forty-two billion, one hundred thirty-six million, four hundred twenty thousand, five hundred twenty".