68031371869 has 8 divisors (see below), whose sum is σ = 68086409720. Its totient is φ = 67976361216.

The previous prime is 68031371857. The next prime is 68031371897. The reversal of 68031371869 is 96817313086.

68031371869 = T₁ + T₂ + ... + T₇₄₁₇.

68031371869 is a nontrivial binomial coefficient, being equal to C(7419, 3).

It can be written as a sum of positive squares in 4 ways, for example, as 19736035225 + 48295336644 = 140485^2 + 219762^2 .

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

It is a 5-Lehmer number, since φ(68031371869) divides (68031371869-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 68031371869 - 2⁹ = 68031371357 is a prime.

It is a super-2 number, since 2×68031371869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68031372869) by changing a digit.

It is the 7417-th tetrahedral number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9168649 + ... + 9176065.

It is an arithmetic number, because the mean of its divisors is an integer number (8510801215).

Almost surely, 2^68031371869 is an apocalyptic number.

It is an amenable number.

68031371869 is a deficient number, since it is larger than the sum of its proper divisors (55037851).

68031371869 is a wasteful number, since it uses less digits than its factorization.

68031371869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13599.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 68031371869 in words is "sixty-eight billion, thirty-one million, three hundred seventy-one thousand, eight hundred sixty-nine".