691241692752 has 320 divisors, whose sum is σ = 2166408840960. Its totient is φ = 209755201536.

The previous prime is 691241692723. The next prime is 691241692753. The reversal of 691241692752 is 257296142196.

It is a happy number.

691241692752 is a `hidden beast` number, since 6 + 91 + 2 + 416 + 92 + 7 + 52 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691241692753) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 140010028 + ... + 140014964.

It is an arithmetic number, because the mean of its divisors is an integer number (6770027628).

Almost surely, 2^691241692752 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 691241692752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083204420480).

691241692752 is an abundant number, since it is smaller than the sum of its proper divisors (1475167148208).

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

691241692752 is a wasteful number, since it uses less digits than its factorization.

691241692752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5307 (or 5295 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 691241692752 in words is "six hundred ninety-one billion, two hundred forty-one million, six hundred ninety-two thousand, seven hundred fifty-two".