40686321758 has 4 divisors (see below), whose sum is σ = 61029482640. Its totient is φ = 20343160878.

The previous prime is 40686321757. The next prime is 40686321761. The reversal of 40686321758 is 85712368604.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40686321757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171580438 + ... + 10171580441.

It is an arithmetic number, because the mean of its divisors is an integer number (15257370660).

Almost surely, 2^40686321758 is an apocalyptic number.

40686321758 is a deficient number, since it is larger than the sum of its proper divisors (20343160882).

40686321758 is a wasteful number, since it uses less digits than its factorization.

40686321758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20343160881.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 40686321758 in words is "forty billion, six hundred eighty-six million, three hundred twenty-one thousand, seven hundred fifty-eight".