2543000644546 has 4 divisors (see below), whose sum is σ = 3814500966822. Its totient is φ = 1271500322272.

The previous prime is 2543000644537. The next prime is 2543000644559. The reversal of 2543000644546 is 6454460003452.

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

It can be written as a sum of positive squares in only one way, i.e., 2493667348225 + 49333296321 = 1579135^2 + 222111^2 .

It is a super-2 number, since 2×2543000644546² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635750161135 + ... + 635750161138.

Almost surely, 2^{2543000644546} is an apocalyptic number.

2543000644546 is a deficient number, since it is larger than the sum of its proper divisors (1271500322276).

2543000644546 is a wasteful number, since it uses less digits than its factorization.

2543000644546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271500322275.

The product of its (nonzero) digits is 1382400, while the sum is 43.

Adding to 2543000644546 its reverse (6454460003452), we get a palindrome (8997460647998).

The spelling of 2543000644546 in words is "two trillion, five hundred forty-three billion, six hundred forty-four thousand, five hundred forty-six".