6661500051 has 32 divisors (see below), whose sum is σ = 9530357760. Its totient is φ = 4128537600.

The previous prime is 6661500049. The next prime is 6661500061. The reversal of 6661500051 is 1500051666.

It is not a de Polignac number, because 6661500051 - 2¹ = 6661500049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6661499991 and 6661500018.

It is not an unprimeable number, because it can be changed into a prime (6661500061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 762315 + ... + 771003.

It is an arithmetic number, because the mean of its divisors is an integer number (297823680).

Almost surely, 2^6661500051 is an apocalyptic number.

6661500051 is a deficient number, since it is larger than the sum of its proper divisors (2868857709).

6661500051 is a wasteful number, since it uses less digits than its factorization.

6661500051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 6661500051 is about 81618.0130302129. The cubic root of 6661500051 is about 1881.5857349593.

The spelling of 6661500051 in words is "six billion, six hundred sixty-one million, five hundred thousand, fifty-one".