1066645378 has 16 divisors (see below), whose sum is σ = 1670518080. Its totient is φ = 509833456.

The previous prime is 1066645369. The next prime is 1066645379. The reversal of 1066645378 is 8735466601.

It is a super-2 number, since 2×1066645378² = 2275464724817525768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (1066645379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85176 + ... + 96892.

It is an arithmetic number, because the mean of its divisors is an integer number (104407380).

Almost surely, 2^1066645378 is an apocalyptic number.

1066645378 is a deficient number, since it is larger than the sum of its proper divisors (603872702).

1066645378 is a wasteful number, since it uses less digits than its factorization.

1066645378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13721.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 1066645378 is about 32659.5373206664. The cubic root of 1066645378 is about 1021.7391124353.

The spelling of 1066645378 in words is "one billion, sixty-six million, six hundred forty-five thousand, three hundred seventy-eight".