401581943616 has 56 divisors (see below), whose sum is σ = 1214307309760. Its totient is φ = 114737697792.

The previous prime is 401581943561. The next prime is 401581943617. The reversal of 401581943616 is 616349185104.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×401581943616² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401581943617) 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, 149396701 + ... + 149399388.

Almost surely, 2^401581943616 is an apocalyptic number.

It is an amenable number.

401581943616 is an abundant number, since it is smaller than the sum of its proper divisors (812725366144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401581943616 is a wasteful number, since it uses less digits than its factorization.

401581943616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298796111 (or 298796101 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 401581943616 in words is "four hundred one billion, five hundred eighty-one million, nine hundred forty-three thousand, six hundred sixteen".