401726567755661 has 2 divisors, whose sum is σ = 401726567755662. Its totient is φ = 401726567755660.

The previous prime is 401726567755627. The next prime is 401726567755787. The reversal of 401726567755661 is 166557765627104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240466893930025 + 161259673825636 = 15506995^2 + 12698806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401726567755661 is a prime.

It is a super-2 number, since 2×401726567755661² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401726567755591 and 401726567755600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401726567752661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200863283877830 + 200863283877831.

It is an arithmetic number, because the mean of its divisors is an integer number (200863283877831).

Almost surely, 2^{401726567755661} is an apocalyptic number.

It is an amenable number.

401726567755661 is a deficient number, since it is larger than the sum of its proper divisors (1).

401726567755661 is an equidigital number, since it uses as much as digits as its factorization.

401726567755661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528000, while the sum is 68.

The spelling of 401726567755661 in words is "four hundred one trillion, seven hundred twenty-six billion, five hundred sixty-seven million, seven hundred fifty-five thousand, six hundred sixty-one".