6166661506 has 4 divisors (see below), whose sum is σ = 9249992262. Its totient is φ = 3083330752.

The previous prime is 6166661503. The next prime is 6166661507. The reversal of 6166661506 is 6051666616.

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

It can be written as a sum of positive squares in only one way, i.e., 4265265481 + 1901396025 = 65309^2 + 43605^2 .

It is not an unprimeable number, because it can be changed into a prime (6166661503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1541665375 + ... + 1541665378.

Almost surely, 2^6166661506 is an apocalyptic number.

6166661506 is a deficient number, since it is larger than the sum of its proper divisors (3083330756).

6166661506 is a wasteful number, since it uses less digits than its factorization.

6166661506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083330755.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 6166661506 is about 78528.0937372097. The cubic root of 6166661506 is about 1833.7918436730.

The spelling of 6166661506 in words is "six billion, one hundred sixty-six million, six hundred sixty-one thousand, five hundred six".