1666077740 has 24 divisors (see below), whose sum is σ = 3531466512. Its totient is φ = 660201920.

The previous prime is 1666077739. The next prime is 1666077767. The reversal of 1666077740 is 477706661.

It is a junction number, because it is equal to n+sod(n) for n = 1666077691 and 1666077700.

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, 387131 + ... + 391410.

It is an arithmetic number, because the mean of its divisors is an integer number (147144438).

Almost surely, 2^1666077740 is an apocalyptic number.

1666077740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666077740 is an abundant number, since it is smaller than the sum of its proper divisors (1865388772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666077740 is a wasteful number, since it uses less digits than its factorization.

1666077740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778657 (or 778655 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 1666077740 is about 40817.6155599516. The cubic root of 1666077740 is about 1185.4914350902.

The spelling of 1666077740 in words is "one billion, six hundred sixty-six million, seventy-seven thousand, seven hundred forty".