68909400037 has 4 divisors (see below), whose sum is σ = 68999951916. Its totient is φ = 68818848160.

The previous prime is 68909400019. The next prime is 68909400083. The reversal of 68909400037 is 73000490986.

It is a Cunningham number, because it is equal to 262506²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73000490986 = 2 ⋅36500245493.

It can be written as a sum of positive squares in 2 ways, for example, as 181010116 + 68728389921 = 13454^2 + 262161^2 .

It is a cyclic number.

It is not a de Polignac number, because 68909400037 - 2¹¹ = 68909397989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68909400037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68909400097) 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, 45274798 + ... + 45276319.

It is an arithmetic number, because the mean of its divisors is an integer number (17249987979).

Almost surely, 2^68909400037 is an apocalyptic number.

It is an amenable number.

68909400037 is a deficient number, since it is larger than the sum of its proper divisors (90551879).

68909400037 is an equidigital number, since it uses as much as digits as its factorization.

68909400037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90551878.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 68909400037 in words is "sixty-eight billion, nine hundred nine million, four hundred thousand, thirty-seven".