6670051261 has 4 divisors (see below), whose sum is σ = 6671315772. Its totient is φ = 6668786752.

The previous prime is 6670051259. The next prime is 6670051273. The reversal of 6670051261 is 1621500766.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3318336025 + 3351715236 = 57605^2 + 57894^2 .

It is a cyclic number.

It is not a de Polignac number, because 6670051261 - 2¹ = 6670051259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6670055261) 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 3 ways as a sum of consecutive naturals, for example, 624310 + ... + 634903.

It is an arithmetic number, because the mean of its divisors is an integer number (1667828943).

Almost surely, 2^6670051261 is an apocalyptic number.

It is an amenable number.

6670051261 is a deficient number, since it is larger than the sum of its proper divisors (1264511).

6670051261 is a wasteful number, since it uses less digits than its factorization.

6670051261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264510.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 6670051261 is about 81670.3817855653. The cubic root of 6670051261 is about 1882.3905063982.

The spelling of 6670051261 in words is "six billion, six hundred seventy million, fifty-one thousand, two hundred sixty-one".