3125016661 has 8 divisors (see below), whose sum is σ = 3370661784. Its totient is φ = 2880122880.

The previous prime is 3125016637. The next prime is 3125016673. The reversal of 3125016661 is 1666105213.

It can be written as a sum of positive squares in 4 ways, for example, as 1170050436 + 1954966225 = 34206^2 + 44215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3125016661 - 2²⁵ = 3091462229 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 (3125010661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179176 + ... + 195841.

It is an arithmetic number, because the mean of its divisors is an integer number (421332723).

Almost surely, 2^3125016661 is an apocalyptic number.

It is an amenable number.

3125016661 is a deficient number, since it is larger than the sum of its proper divisors (245645123).

3125016661 is a wasteful number, since it uses less digits than its factorization.

3125016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375671.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 3125016661 is about 55901.8484578104. The cubic root of 3125016661 is about 1462.0114673450.

The spelling of 3125016661 in words is "three billion, one hundred twenty-five million, sixteen thousand, six hundred sixty-one".