400526446640491 has 2 divisors, whose sum is σ = 400526446640492. Its totient is φ = 400526446640490.

The previous prime is 400526446640483. The next prime is 400526446640497. The reversal of 400526446640491 is 194046644625004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400526446640491 - 2³ = 400526446640483 is a prime.

It is not a weakly prime, because it can be changed into another prime (400526446640497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200263223320245 + 200263223320246.

It is an arithmetic number, because the mean of its divisors is an integer number (200263223320246).

Almost surely, 2^{400526446640491} is an apocalyptic number.

400526446640491 is a deficient number, since it is larger than the sum of its proper divisors (1).

400526446640491 is an equidigital number, since it uses as much as digits as its factorization.

400526446640491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 55.

The spelling of 400526446640491 in words is "four hundred trillion, five hundred twenty-six billion, four hundred forty-six million, six hundred forty thousand, four hundred ninety-one".