1666270078 has 16 divisors (see below), whose sum is σ = 2727429120. Its totient is φ = 757171800.

The previous prime is 1666270043. The next prime is 1666270141. The reversal of 1666270078 is 8700726661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82393 + ... + 100603.

It is an arithmetic number, because the mean of its divisors is an integer number (170464320).

Almost surely, 2^1666270078 is an apocalyptic number.

1666270078 is a deficient number, since it is larger than the sum of its proper divisors (1061159042).

1666270078 is a wasteful number, since it uses less digits than its factorization.

1666270078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22383.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 1666270078 is about 40819.9715580499. The cubic root of 1666270078 is about 1185.5370524650.

The spelling of 1666270078 in words is "one billion, six hundred sixty-six million, two hundred seventy thousand, seventy-eight".