691012012201 has 16 divisors (see below), whose sum is σ = 815953346560. Its totient is φ = 572662178640.

The previous prime is 691012012199. The next prime is 691012012217. The reversal of 691012012201 is 102210210196.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 691012012201 - 2¹ = 691012012199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691012012261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1228881 + ... + 1700638.

It is an arithmetic number, because the mean of its divisors is an integer number (50997084160).

Almost surely, 2^691012012201 is an apocalyptic number.

It is an amenable number.

691012012201 is a deficient number, since it is larger than the sum of its proper divisors (124941334359).

691012012201 is a wasteful number, since it uses less digits than its factorization.

691012012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930644.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 691012012201 its reverse (102210210196), we get a palindrome (793222222397).

The spelling of 691012012201 in words is "six hundred ninety-one billion, twelve million, twelve thousand, two hundred one".