691845066 has 48 divisors (see below), whose sum is σ = 1637363520. Its totient is φ = 209381760.

The previous prime is 691845047. The next prime is 691845101. The reversal of 691845066 is 660548196.

691845066 is a `hidden beast` number, since 69 + 1 + 84 + 506 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198051 + ... + 201513.

It is an arithmetic number, because the mean of its divisors is an integer number (34111740).

Almost surely, 2^691845066 is an apocalyptic number.

691845066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

691845066 is an abundant number, since it is smaller than the sum of its proper divisors (945518454).

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

691845066 is a wasteful number, since it uses less digits than its factorization.

691845066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491 (or 4488 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 691845066 is about 26302.9478576071. The cubic root of 691845066 is about 884.4425254804.

It can be divided in two parts, 6918 and 45066, that added together give a square (51984 = 228²).

The spelling of 691845066 in words is "six hundred ninety-one million, eight hundred forty-five thousand, sixty-six".