2145540342505 has 32 divisors (see below), whose sum is σ = 3021161197824. Its totient is φ = 1432108290816.

The previous prime is 2145540342503. The next prime is 2145540342541. The reversal of 2145540342505 is 5052430455412.

It is not a de Polignac number, because 2145540342505 - 2¹ = 2145540342503 is a prime.

It is a super-3 number, since 3×2145540342505³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2145540342503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1991814 + ... + 2873743.

It is an arithmetic number, because the mean of its divisors is an integer number (94411287432).

Almost surely, 2^{2145540342505} is an apocalyptic number.

It is an amenable number.

2145540342505 is a deficient number, since it is larger than the sum of its proper divisors (875620855319).

2145540342505 is a wasteful number, since it uses less digits than its factorization.

2145540342505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4865905.

The product of its (nonzero) digits is 480000, while the sum is 40.

Adding to 2145540342505 its reverse (5052430455412), we get a palindrome (7197970797917).

The spelling of 2145540342505 in words is "two trillion, one hundred forty-five billion, five hundred forty million, three hundred forty-two thousand, five hundred five".