400611221475541 has 2 divisors, whose sum is σ = 400611221475542. Its totient is φ = 400611221475540.

The previous prime is 400611221475539. The next prime is 400611221475623. The reversal of 400611221475541 is 145574122116004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390729189130641 + 9882032344900 = 19766871^2 + 3143570^2 .

It is a cyclic number.

It is not a de Polignac number, because 400611221475541 - 2¹ = 400611221475539 is a prime.

It is a super-2 number, since 2×400611221475541² (a number of 30 digits) contains 22 as substring.

Together with 400611221475539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400611221415541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200305610737770 + 200305610737771.

It is an arithmetic number, because the mean of its divisors is an integer number (200305610737771).

Almost surely, 2^{400611221475541} is an apocalyptic number.

It is an amenable number.

400611221475541 is a deficient number, since it is larger than the sum of its proper divisors (1).

400611221475541 is an equidigital number, since it uses as much as digits as its factorization.

400611221475541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 400611221475541 in words is "four hundred trillion, six hundred eleven billion, two hundred twenty-one million, four hundred seventy-five thousand, five hundred forty-one".