1691910066 has 64 divisors (see below), whose sum is σ = 4244244480. Its totient is φ = 436805760.

The previous prime is 1691910053. The next prime is 1691910079. The reversal of 1691910066 is 6600191961.

It is an interprime number because it is at equal distance from previous prime (1691910053) and next prime (1691910079).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66190 + ... + 88118.

It is an arithmetic number, because the mean of its divisors is an integer number (66316320).

Almost surely, 2^1691910066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691910066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2122122240).

1691910066 is an abundant number, since it is smaller than the sum of its proper divisors (2552334414).

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

1691910066 is a wasteful number, since it uses less digits than its factorization.

1691910066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22119.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1691910066 is about 41132.8344027007. The cubic root of 1691910066 is about 1191.5870043693.

The spelling of 1691910066 in words is "one billion, six hundred ninety-one million, nine hundred ten thousand, sixty-six".