1672791666 has 64 divisors (see below), whose sum is σ = 4175732736. Its totient is φ = 434952000.

The previous prime is 1672791661. The next prime is 1672791667. The reversal of 1672791666 is 6661972761.

It is a happy number.

1672791666 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1672791661) 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, 17191 + ... + 60341.

It is an arithmetic number, because the mean of its divisors is an integer number (65245824).

Almost surely, 2^1672791666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1672791666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2087866368).

1672791666 is an abundant number, since it is smaller than the sum of its proper divisors (2502941070).

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

1672791666 is a wasteful number, since it uses less digits than its factorization.

1672791666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43247.

The product of its digits is 1143072, while the sum is 51.

The square root of 1672791666 is about 40899.7758673565. The cubic root of 1672791666 is about 1187.0817238743.

The spelling of 1672791666 in words is "one billion, six hundred seventy-two million, seven hundred ninety-one thousand, six hundred sixty-six".