691356349607 has 32 divisors (see below), whose sum is σ = 872451240960. Its totient is φ = 532182078720.

The previous prime is 691356349603. The next prime is 691356349609. The reversal of 691356349607 is 706943653196.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 691356349607 - 2² = 691356349603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691356349601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3137213 + ... + 3350345.

It is an arithmetic number, because the mean of its divisors is an integer number (27264101280).

Almost surely, 2^691356349607 is an apocalyptic number.

691356349607 is a deficient number, since it is larger than the sum of its proper divisors (181094891353).

691356349607 is a wasteful number, since it uses less digits than its factorization.

691356349607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213663.

The product of its (nonzero) digits is 22044960, while the sum is 59.

The spelling of 691356349607 in words is "six hundred ninety-one billion, three hundred fifty-six million, three hundred forty-nine thousand, six hundred seven".