97688129881 has 4 divisors (see below), whose sum is σ = 97707699892. Its totient is φ = 97668559872.

The previous prime is 97688129879. The next prime is 97688129927. The reversal of 97688129881 is 18892188679.

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 65489416281 + 32198713600 = 255909^2 + 179440^2 .

It is a cyclic number.

It is not a de Polignac number, because 97688129881 - 2¹ = 97688129879 is a prime.

It is a super-2 number, since 2×97688129881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97688129681) 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, 9777516 + ... + 9787501.

It is an arithmetic number, because the mean of its divisors is an integer number (24426924973).

Almost surely, 2^97688129881 is an apocalyptic number.

It is an amenable number.

97688129881 is a deficient number, since it is larger than the sum of its proper divisors (19570011).

97688129881 is a wasteful number, since it uses less digits than its factorization.

97688129881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19570010.

The product of its digits is 27869184, while the sum is 67.

The spelling of 97688129881 in words is "ninety-seven billion, six hundred eighty-eight million, one hundred twenty-nine thousand, eight hundred eighty-one".