2556451042 has 4 divisors (see below), whose sum is σ = 3834676566. Its totient is φ = 1278225520.

The previous prime is 2556451019. The next prime is 2556451049. The reversal of 2556451042 is 2401546552.

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., 2332020681 + 224430361 = 48291^2 + 14981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2556450989 and 2556451007.

It is not an unprimeable number, because it can be changed into a prime (2556451049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639112759 + ... + 639112762.

Almost surely, 2^2556451042 is an apocalyptic number.

2556451042 is a deficient number, since it is larger than the sum of its proper divisors (1278225524).

2556451042 is a wasteful number, since it uses less digits than its factorization.

2556451042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278225523.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 2556451042 is about 50561.3591787246. The cubic root of 2556451042 is about 1367.3483157459.

Adding to 2556451042 its reverse (2401546552), we get a palindrome (4957997594).

The spelling of 2556451042 in words is "two billion, five hundred fifty-six million, four hundred fifty-one thousand, forty-two".