42001215541 has 4 divisors (see below), whose sum is σ = 42576574732. Its totient is φ = 41425856352.

The previous prime is 42001215527. The next prime is 42001215559. The reversal of 42001215541 is 14551210024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35298518641 + 6702696900 = 187879^2 + 81870^2 .

It is a cyclic number.

It is not a de Polignac number, because 42001215541 - 2¹¹ = 42001213493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001215511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287679486 + ... + 287679631.

It is an arithmetic number, because the mean of its divisors is an integer number (10644143683).

Almost surely, 2^42001215541 is an apocalyptic number.

It is an amenable number.

42001215541 is a deficient number, since it is larger than the sum of its proper divisors (575359191).

42001215541 is an equidigital number, since it uses as much as digits as its factorization.

42001215541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575359190.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 42001215541 its reverse (14551210024), we get a palindrome (56552425565).

The spelling of 42001215541 in words is "forty-two billion, one million, two hundred fifteen thousand, five hundred forty-one".