2540620543 has 4 divisors (see below), whose sum is σ = 2540783728. Its totient is φ = 2540457360.

The previous prime is 2540620517. The next prime is 2540620591. The reversal of 2540620543 is 3450260452.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540620543 is a prime.

It is a super-2 number, since 2×2540620543² = 12909505487027229698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540660543) 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, 55446 + ... + 90307.

It is an arithmetic number, because the mean of its divisors is an integer number (635195932).

Almost surely, 2^2540620543 is an apocalyptic number.

2540620543 is a deficient number, since it is larger than the sum of its proper divisors (163185).

2540620543 is a wasteful number, since it uses less digits than its factorization.

2540620543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163184.

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 2540620543 is about 50404.5686718972. The cubic root of 2540620543 is about 1364.5200928475.

Adding to 2540620543 its reverse (3450260452), we get a palindrome (5990880995).

The spelling of 2540620543 in words is "two billion, five hundred forty million, six hundred twenty thousand, five hundred forty-three".