697242730781 has 4 divisors (see below), whose sum is σ = 697248549564. Its totient is φ = 697236912000.

The previous prime is 697242730753. The next prime is 697242730787. The reversal of 697242730781 is 187037242796.

It is a happy number.

697242730781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98151250681 + 599091480100 = 313291^2 + 774010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697242730781 is a prime.

It is a super-2 number, since 2×697242730781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697242730787) 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, 2725790 + ... + 2970591.

It is an arithmetic number, because the mean of its divisors is an integer number (174312137391).

Almost surely, 2^697242730781 is an apocalyptic number.

It is an amenable number.

697242730781 is a deficient number, since it is larger than the sum of its proper divisors (5818783).

697242730781 is a wasteful number, since it uses less digits than its factorization.

697242730781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818782.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 697242730781 in words is "six hundred ninety-seven billion, two hundred forty-two million, seven hundred thirty thousand, seven hundred eighty-one".