42145356561 has 64 divisors (see below), whose sum is σ = 75464441856. Its totient is φ = 20266171200.

The previous prime is 42145356551. The next prime is 42145356577. The reversal of 42145356561 is 16565354124.

It is not a de Polignac number, because 42145356561 - 2⁵ = 42145356529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42145356551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36760 + ... + 292646.

It is an arithmetic number, because the mean of its divisors is an integer number (1179131904).

Almost surely, 2^42145356561 is an apocalyptic number.

It is an amenable number.

42145356561 is a deficient number, since it is larger than the sum of its proper divisors (33319085295).

42145356561 is a wasteful number, since it uses less digits than its factorization.

42145356561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255962.

The product of its digits is 432000, while the sum is 42.

The spelling of 42145356561 in words is "forty-two billion, one hundred forty-five million, three hundred fifty-six thousand, five hundred sixty-one".