691557243143 has 8 divisors (see below), whose sum is σ = 748612785648. Its totient is φ = 635052962304.

The previous prime is 691557243119. The next prime is 691557243191. The reversal of 691557243143 is 341342755196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691557243143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691557243091 and 691557243100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691557243343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137812805 + ... + 137817822.

It is an arithmetic number, because the mean of its divisors is an integer number (93576598206).

Almost surely, 2^691557243143 is an apocalyptic number.

691557243143 is a deficient number, since it is larger than the sum of its proper divisors (57055542505).

691557243143 is a wasteful number, since it uses less digits than its factorization.

691557243143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275630833.

The product of its digits is 2721600, while the sum is 50.

The spelling of 691557243143 in words is "six hundred ninety-one billion, five hundred fifty-seven million, two hundred forty-three thousand, one hundred forty-three".