691047150221 has 16 divisors (see below), whose sum is σ = 696250828224. Its totient is φ = 685868811264.

The previous prime is 691047150107. The next prime is 691047150223. The reversal of 691047150221 is 122051740196.

691047150221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691047150221 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 (691047150223) 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, 74889410 + ... + 74898636.

It is an arithmetic number, because the mean of its divisors is an integer number (43515676764).

Almost surely, 2^691047150221 is an apocalyptic number.

It is an amenable number.

691047150221 is a deficient number, since it is larger than the sum of its proper divisors (5203678003).

691047150221 is a wasteful number, since it uses less digits than its factorization.

691047150221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10540.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 691047150221 in words is "six hundred ninety-one billion, forty-seven million, one hundred fifty thousand, two hundred twenty-one".