401675579821 has 2 divisors, whose sum is σ = 401675579822. Its totient is φ = 401675579820.

The previous prime is 401675579797. The next prime is 401675579857. The reversal of 401675579821 is 128975576104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238423217796 + 163252362025 = 488286^2 + 404045^2 .

It is a cyclic number.

It is not a de Polignac number, because 401675579821 - 2¹³ = 401675571629 is a prime.

It is a super-2 number, since 2×401675579821² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401675579621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200837789910 + 200837789911.

It is an arithmetic number, because the mean of its divisors is an integer number (200837789911).

Almost surely, 2^401675579821 is an apocalyptic number.

It is an amenable number.

401675579821 is a deficient number, since it is larger than the sum of its proper divisors (1).

401675579821 is an equidigital number, since it uses as much as digits as its factorization.

401675579821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4233600, while the sum is 55.

It can be divided in two parts, 4016755 and 79821, that added together give a square (4096576 = 2024²).

The spelling of 401675579821 in words is "four hundred one billion, six hundred seventy-five million, five hundred seventy-nine thousand, eight hundred twenty-one".