691421121124196 has 6 divisors (see below), whose sum is σ = 1209986961967350. Its totient is φ = 345710560562096.

The previous prime is 691421121124031. The next prime is 691421121124219.

691421121124196 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 674409736360000 + 17011384764196 = 25969400^2 + 4124486^2 .

It is a super-2 number, since 2×691421121124196² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86427640140521 + ... + 86427640140528.

It is an arithmetic number, because the mean of its divisors is an integer number (201664493661225).

Almost surely, 2^{691421121124196} is an apocalyptic number.

It is an amenable number.

691421121124196 is a deficient number, since it is larger than the sum of its proper divisors (518565840843154).

691421121124196 is a wasteful number, since it uses less digits than its factorization.

691421121124196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172855280281053 (or 172855280281051 counting only the distinct ones).

The product of its digits is 373248, while the sum is 50.

The spelling of 691421121124196 in words is "six hundred ninety-one trillion, four hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-four thousand, one hundred ninety-six".