842402395581 has 32 divisors (see below), whose sum is σ = 1226169809280. Its totient is φ = 512279248896.

The previous prime is 842402395579. The next prime is 842402395603. The reversal of 842402395581 is 185593204248.

It is not a de Polignac number, because 842402395581 - 2¹ = 842402395579 is a prime.

It is a super-2 number, since 2×842402395581² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842402395511) 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 31 ways as a sum of consecutive naturals, for example, 383571 + ... + 1353488.

It is an arithmetic number, because the mean of its divisors is an integer number (38317806540).

Almost surely, 2^842402395581 is an apocalyptic number.

It is an amenable number.

842402395581 is a deficient number, since it is larger than the sum of its proper divisors (383767413699).

842402395581 is a wasteful number, since it uses less digits than its factorization.

842402395581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737373.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 842402395581 in words is "eight hundred forty-two billion, four hundred two million, three hundred ninety-five thousand, five hundred eighty-one".