31066206640 has 160 divisors (see below), whose sum is σ = 89264001024. Its totient is φ = 9811292160.

The previous prime is 31066206629. The next prime is 31066206643. The reversal of 31066206640 is 4660266013.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 31066206596 and 31066206605.

It is not an unprimeable number, because it can be changed into a prime (31066206643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 412725 + ... + 482155.

Almost surely, 2^31066206640 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 31066206640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44632000512).

31066206640 is an abundant number, since it is smaller than the sum of its proper divisors (58197794384).

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

31066206640 is a wasteful number, since it uses less digits than its factorization.

31066206640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69515 (or 69509 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 31066206640 in words is "thirty-one billion, sixty-six million, two hundred six thousand, six hundred forty".