400811811377 has 2 divisors, whose sum is σ = 400811811378. Its totient is φ = 400811811376.

The previous prime is 400811811359. The next prime is 400811811397. The reversal of 400811811377 is 773118118004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242133869041 + 158677942336 = 492071^2 + 398344^2 .

It is a cyclic number.

It is not a de Polignac number, because 400811811377 - 2²⁰ = 400810762801 is a prime.

It is a super-2 number, since 2×400811811377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400811811397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200405905688 + 200405905689.

It is an arithmetic number, because the mean of its divisors is an integer number (200405905689).

Almost surely, 2^400811811377 is an apocalyptic number.

It is an amenable number.

400811811377 is a deficient number, since it is larger than the sum of its proper divisors (1).

400811811377 is an equidigital number, since it uses as much as digits as its factorization.

400811811377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 41.

The spelling of 400811811377 in words is "four hundred billion, eight hundred eleven million, eight hundred eleven thousand, three hundred seventy-seven".