140391378065 has 4 divisors (see below), whose sum is σ = 168469653684. Its totient is φ = 112313102448.

The previous prime is 140391378041. The next prime is 140391378107. The reversal of 140391378065 is 560873193041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56783077264 + 83608300801 = 238292^2 + 289151^2 .

It is a cyclic number.

It is not a de Polignac number, because 140391378065 - 2¹⁰ = 140391377041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14039137802 + ... + 14039137811.

It is an arithmetic number, because the mean of its divisors is an integer number (42117413421).

Almost surely, 2^140391378065 is an apocalyptic number.

It is an amenable number.

140391378065 is a deficient number, since it is larger than the sum of its proper divisors (28078275619).

140391378065 is an equidigital number, since it uses as much as digits as its factorization.

140391378065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28078275618.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 140391378065 in words is "one hundred forty billion, three hundred ninety-one million, three hundred seventy-eight thousand, sixty-five".