1666712376 has 320 divisors, whose sum is σ = 5708102400. Its totient is φ = 443791872.

The previous prime is 1666712363. The next prime is 1666712381. The reversal of 1666712376 is 6732176661.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7153156 + ... + 7153388.

It is an arithmetic number, because the mean of its divisors is an integer number (17837820).

Almost surely, 2^1666712376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666712376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2854051200).

1666712376 is an abundant number, since it is smaller than the sum of its proper divisors (4041390024).

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

1666712376 is a wasteful number, since it uses less digits than its factorization.

1666712376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 347 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 1666712376 is about 40825.3888652637. The cubic root of 1666712376 is about 1185.6419402790.

The spelling of 1666712376 in words is "one billion, six hundred sixty-six million, seven hundred twelve thousand, three hundred seventy-six".