40185723623 has 2 divisors, whose sum is σ = 40185723624. Its totient is φ = 40185723622.

The previous prime is 40185723541. The next prime is 40185723629. The reversal of 40185723623 is 32632758104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40185723623 - 2²² = 40181529319 is a prime.

It is a super-2 number, since 2×40185723623² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40185723629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20092861811 + 20092861812.

It is an arithmetic number, because the mean of its divisors is an integer number (20092861812).

Almost surely, 2^40185723623 is an apocalyptic number.

40185723623 is a deficient number, since it is larger than the sum of its proper divisors (1).

40185723623 is an equidigital number, since it uses as much as digits as its factorization.

40185723623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 40185723623 in words is "forty billion, one hundred eighty-five million, seven hundred twenty-three thousand, six hundred twenty-three".