97919878681 has 8 divisors (see below), whose sum is σ = 98158604544. Its totient is φ = 97681328640.

The previous prime is 97919878669. The next prime is 97919878723. The reversal of 97919878681 is 18687891979.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97919878681 - 2⁹ = 97919878169 is a prime.

It is a super-2 number, since 2×97919878681² (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 (97919878781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1107801 + ... + 1192921.

It is an arithmetic number, because the mean of its divisors is an integer number (12269825568).

Almost surely, 2^97919878681 is an apocalyptic number.

It is an amenable number.

97919878681 is a deficient number, since it is larger than the sum of its proper divisors (238725863).

97919878681 is a wasteful number, since it uses less digits than its factorization.

97919878681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87911.

The product of its digits is 109734912, while the sum is 73.

The spelling of 97919878681 in words is "ninety-seven billion, nine hundred nineteen million, eight hundred seventy-eight thousand, six hundred eighty-one".