42420551636 has 12 divisors (see below), whose sum is σ = 74272784628. Its totient is φ = 21199756032.

The previous prime is 42420551627. The next prime is 42420551681. The reversal of 42420551636 is 63615502424.

It can be written as a sum of positive squares in 2 ways, for example, as 29821836100 + 12598715536 = 172690^2 + 112244^2 .

It is a super-2 number, since 2×42420551636² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42420551636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2620871 + ... + 2637006.

It is an arithmetic number, because the mean of its divisors is an integer number (6189398719).

Almost surely, 2^42420551636 is an apocalyptic number.

It is an amenable number.

42420551636 is a deficient number, since it is larger than the sum of its proper divisors (31852232992).

42420551636 is a wasteful number, since it uses less digits than its factorization.

42420551636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259898 (or 5259896 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 42420551636 in words is "forty-two billion, four hundred twenty million, five hundred fifty-one thousand, six hundred thirty-six".