68187051749 has 4 divisors (see below), whose sum is σ = 68189730336. Its totient is φ = 68184373164.

The previous prime is 68187051739. The next prime is 68187051787. The reversal of 68187051749 is 94715078186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68187051749 - 2¹² = 68187047653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68187051694 and 68187051703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68187051739) 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, 1300739 + ... + 1352144.

It is an arithmetic number, because the mean of its divisors is an integer number (17047432584).

Almost surely, 2^68187051749 is an apocalyptic number.

It is an amenable number.

68187051749 is a deficient number, since it is larger than the sum of its proper divisors (2678587).

68187051749 is a wasteful number, since it uses less digits than its factorization.

68187051749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678586.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 68187051749 in words is "sixty-eight billion, one hundred eighty-seven million, fifty-one thousand, seven hundred forty-nine".