688722523877631 has 16 divisors (see below), whose sum is σ = 984120551161344. Its totient is φ = 427315502474784.

The previous prime is 688722523877551. The next prime is 688722523877651. The reversal of 688722523877631 is 136778325227886.

It is not a de Polignac number, because 688722523877631 - 2¹⁴ = 688722523861247 is a prime.

It is a super-2 number, since 2×688722523877631² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688722523877651) 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, 134884941411 + ... + 134884946516.

It is an arithmetic number, because the mean of its divisors is an integer number (61507534447584).

Almost surely, 2^{688722523877631} is an apocalyptic number.

688722523877631 is a deficient number, since it is larger than the sum of its proper divisors (295398027283713).

688722523877631 is a wasteful number, since it uses less digits than its factorization.

688722523877631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269769887990.

The product of its digits is 2275983360, while the sum is 75.

The spelling of 688722523877631 in words is "six hundred eighty-eight trillion, seven hundred twenty-two billion, five hundred twenty-three million, eight hundred seventy-seven thousand, six hundred thirty-one".