68654905988 has 6 divisors (see below), whose sum is σ = 120146085486. Its totient is φ = 34327452992.

The previous prime is 68654905981. The next prime is 68654906027. The reversal of 68654905988 is 88950945686.

It can be written as a sum of positive squares in only one way, i.e., 41590707844 + 27064198144 = 203938^2 + 164512^2 .

It is a super-2 number, since 2×68654905988² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68654905981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8581863245 + ... + 8581863252.

It is an arithmetic number, because the mean of its divisors is an integer number (20024347581).

Almost surely, 2^68654905988 is an apocalyptic number.

It is an amenable number.

68654905988 is a deficient number, since it is larger than the sum of its proper divisors (51491179498).

68654905988 is a wasteful number, since it uses less digits than its factorization.

68654905988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17163726501 (or 17163726499 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 68.

The spelling of 68654905988 in words is "sixty-eight billion, six hundred fifty-four million, nine hundred five thousand, nine hundred eighty-eight".