31661670336 has 112 divisors (see below), whose sum is σ = 85713466368. Its totient is φ = 10311552000.

The previous prime is 31661670311. The next prime is 31661670361. The reversal of 31661670336 is 63307616613.

It is an interprime number because it is at equal distance from previous prime (31661670311) and next prime (31661670361).

It is a super-2 number, since 2×31661670336² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1759561 + ... + 1777463.

Almost surely, 2^31661670336 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 31661670336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42856733184).

31661670336 is an abundant number, since it is smaller than the sum of its proper divisors (54051796032).

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

31661670336 is a wasteful number, since it uses less digits than its factorization.

31661670336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18130 (or 18120 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 42.

The spelling of 31661670336 in words is "thirty-one billion, six hundred sixty-one million, six hundred seventy thousand, three hundred thirty-six".