40156721447 has 2 divisors, whose sum is σ = 40156721448. Its totient is φ = 40156721446.

The previous prime is 40156721431. The next prime is 40156721459. The reversal of 40156721447 is 74412765104.

40156721447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40156721447 - 2⁴ = 40156721431 is a prime.

It is a super-2 number, since 2×40156721447² (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 (40156721497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20078360723 + 20078360724.

It is an arithmetic number, because the mean of its divisors is an integer number (20078360724).

Almost surely, 2^40156721447 is an apocalyptic number.

40156721447 is a deficient number, since it is larger than the sum of its proper divisors (1).

40156721447 is an equidigital number, since it uses as much as digits as its factorization.

40156721447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 40156721447 in words is "forty billion, one hundred fifty-six million, seven hundred twenty-one thousand, four hundred forty-seven".