31657055472 has 320 divisors, whose sum is σ = 105514675200. Its totient is φ = 8901135360.

The previous prime is 31657055401. The next prime is 31657055473. The reversal of 31657055472 is 27455075613.

It is a happy number.

31657055472 is a `hidden beast` number, since 3 + 1 + 6 + 570 + 5 + 5 + 4 + 72 = 666.

It is a super-2 number, since 2×31657055472² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31657055473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62194354 + ... + 62194862.

It is an arithmetic number, because the mean of its divisors is an integer number (329733360).

Almost surely, 2^31657055472 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 31657055472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52757337600).

31657055472 is an abundant number, since it is smaller than the sum of its proper divisors (73857619728).

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

31657055472 is a wasteful number, since it uses less digits than its factorization.

31657055472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 31657055472 in words is "thirty-one billion, six hundred fifty-seven million, fifty-five thousand, four hundred seventy-two".