97718978154681 has 27 divisors (see below), whose sum is σ = 152843107298349. Its totient is φ = 60134518540512.

The previous prime is 97718978154547. The next prime is 97718978154689. The reversal of 97718978154681 is 18645187981779.

The square root of 97718978154681 is 9885291.

It is a perfect power (a square), and thus also a powerful number.

97718978154681 is a `hidden beast` number, since 9 + 7 + 7 + 1 + 89 + 78 + 1 + 5 + 468 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 35271305271225 + 62447672883456 = 5938965^2 + 7902384^2 .

It is not a de Polignac number, because 97718978154681 - 2⁹ = 97718978154169 is a prime.

It is a super-2 number, since 2×97718978154681² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97718978154681.

It is not an unprimeable number, because it can be changed into a prime (97718978154689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 385399615 + ... + 385653083.

Almost surely, 2^{97718978154681} is an apocalyptic number.

97718978154681 is the 9885291-st square number.

97718978154681 is the 4942646-th centered octagonal number.

It is an amenable number.

97718978154681 is a deficient number, since it is larger than the sum of its proper divisors (55124129143668).

97718978154681 is an frugal number, since it uses more digits than its factorization.

97718978154681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506970 (or 253485 counting only the distinct ones).

The product of its digits is 1706987520, while the sum is 81.

The spelling of 97718978154681 in words is "ninety-seven trillion, seven hundred eighteen billion, nine hundred seventy-eight million, one hundred fifty-four thousand, six hundred eighty-one".