691867075541071 has 4 divisors (see below), whose sum is σ = 692229879463032. Its totient is φ = 691504271619112.

The previous prime is 691867075541039. The next prime is 691867075541119. The reversal of 691867075541071 is 170145570768196.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 691867075541071 - 2⁵ = 691867075541039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 691867075540988 and 691867075541006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691867075541671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181401958120 + ... + 181401961933.

It is an arithmetic number, because the mean of its divisors is an integer number (173057469865758).

Almost surely, 2^{691867075541071} is an apocalyptic number.

691867075541071 is a deficient number, since it is larger than the sum of its proper divisors (362803921961).

691867075541071 is a wasteful number, since it uses less digits than its factorization.

691867075541071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362803921960.

The product of its (nonzero) digits is 88905600, while the sum is 67.

The spelling of 691867075541071 in words is "six hundred ninety-one trillion, eight hundred sixty-seven billion, seventy-five million, five hundred forty-one thousand, seventy-one".