2661256554 has 16 divisors (see below), whose sum is σ = 5806378080. Its totient is φ = 806441360.

The previous prime is 2661256553. The next prime is 2661256567. The reversal of 2661256554 is 4556521662.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2661256553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20160969 + ... + 20161100.

It is an arithmetic number, because the mean of its divisors is an integer number (362898630).

Almost surely, 2^2661256554 is an apocalyptic number.

2661256554 is an abundant number, since it is smaller than the sum of its proper divisors (3145121526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661256554 is a wasteful number, since it uses less digits than its factorization.

2661256554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40322085.

The product of its digits is 432000, while the sum is 42.

The square root of 2661256554 is about 51587.3681631463. The cubic root of 2661256554 is about 1385.7841231381.

The spelling of 2661256554 in words is "two billion, six hundred sixty-one million, two hundred fifty-six thousand, five hundred fifty-four".