2661256506 has 16 divisors (see below), whose sum is σ = 5397478848. Its totient is φ = 874591200.

The previous prime is 2661256457. The next prime is 2661256553. The reversal of 2661256506 is 6056521662.

It is a happy number.

It is an unprimeable number.

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, 3123115 + ... + 3123966.

It is an arithmetic number, because the mean of its divisors is an integer number (337342428).

Almost surely, 2^2661256506 is an apocalyptic number.

2661256506 is an abundant number, since it is smaller than the sum of its proper divisors (2736222342).

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

2661256506 is a wasteful number, since it uses less digits than its factorization.

2661256506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6247157.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 2661256506 is about 51587.3676979161. The cubic root of 2661256506 is about 1385.7841148065.

The spelling of 2661256506 in words is "two billion, six hundred sixty-one million, two hundred fifty-six thousand, five hundred six".