401234256664561 has 8 divisors (see below), whose sum is σ = 401281548781824. Its totient is φ = 401186966141280.

The previous prime is 401234256664559. The next prime is 401234256664597. The reversal of 401234256664561 is 165466652432104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 401234256664561 - 2¹ = 401234256664559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401234256644561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546839901 + ... + 547573141.

It is an arithmetic number, because the mean of its divisors is an integer number (50160193597728).

Almost surely, 2^{401234256664561} is an apocalyptic number.

It is an amenable number.

401234256664561 is a deficient number, since it is larger than the sum of its proper divisors (47292117263).

401234256664561 is a wasteful number, since it uses less digits than its factorization.

401234256664561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796991.

The product of its (nonzero) digits is 24883200, while the sum is 55.

The spelling of 401234256664561 in words is "four hundred one trillion, two hundred thirty-four billion, two hundred fifty-six million, six hundred sixty-four thousand, five hundred sixty-one".