2506556061 has 6 divisors (see below), whose sum is σ = 3620580990. Its totient is φ = 1671037368.

The previous prime is 2506556047. The next prime is 2506556069. The reversal of 2506556061 is 1606556052.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2087576100 + 418979961 = 45690^2 + 20469^2 .

It is not a de Polignac number, because 2506556061 - 2¹⁴ = 2506539677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506556069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139253106 + ... + 139253123.

It is an arithmetic number, because the mean of its divisors is an integer number (603430165).

Almost surely, 2^2506556061 is an apocalyptic number.

It is an amenable number.

2506556061 is a deficient number, since it is larger than the sum of its proper divisors (1114024929).

2506556061 is a wasteful number, since it uses less digits than its factorization.

2506556061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278506235 (or 278506232 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 2506556061 is about 50065.5176843304. The cubic root of 2506556061 is about 1358.3941652291.

Subtracting from 2506556061 its reverse (1606556052), we obtain a palindrome (900000009).

The spelling of 2506556061 in words is "two billion, five hundred six million, five hundred fifty-six thousand, sixty-one".