400161336272 has 160 divisors (see below), whose sum is σ = 831231797760. Its totient is φ = 186278400000.

The previous prime is 400161336233. The next prime is 400161336283. The reversal of 400161336272 is 272633161004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 864279113 + ... + 864279575.

It is an arithmetic number, because the mean of its divisors is an integer number (5195198736).

Almost surely, 2^400161336272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400161336272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415615898880).

400161336272 is an abundant number, since it is smaller than the sum of its proper divisors (431070461488).

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

400161336272 is a wasteful number, since it uses less digits than its factorization.

400161336272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 967 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

Adding to 400161336272 its reverse (272633161004), we get a palindrome (672794497276).

The spelling of 400161336272 in words is "four hundred billion, one hundred sixty-one million, three hundred thirty-six thousand, two hundred seventy-two".