691283871072 has 192 divisors, whose sum is σ = 2094066616320. Its totient is φ = 221625331200.

The previous prime is 691283870939. The next prime is 691283871107. The reversal of 691283871072 is 270178382196.

It is a happy number.

691283871072 is a `hidden beast` number, since 69 + 128 + 387 + 10 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4286622 + ... + 4444962.

It is an arithmetic number, because the mean of its divisors is an integer number (10906596960).

Almost surely, 2^691283871072 is an apocalyptic number.

691283871072 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691283871072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047033308160).

691283871072 is an abundant number, since it is smaller than the sum of its proper divisors (1402782745248).

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

691283871072 is a wasteful number, since it uses less digits than its factorization.

691283871072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158554 (or 158540 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 691283871072 in words is "six hundred ninety-one billion, two hundred eighty-three million, eight hundred seventy-one thousand, seventy-two".