133971917940 has 72 divisors (see below), whose sum is σ = 464435986560. Its totient is φ = 30622152384.

The previous prime is 133971917917. The next prime is 133971917953. The reversal of 133971917940 is 49719179331.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53162200 + ... + 53164719.

Almost surely, 2^133971917940 is an apocalyptic number.

133971917940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133971917940 is an abundant number, since it is smaller than the sum of its proper divisors (330464068620).

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

133971917940 is a wasteful number, since it uses less digits than its factorization.

133971917940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106326941 (or 106326936 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 54.

The spelling of 133971917940 in words is "one hundred thirty-three billion, nine hundred seventy-one million, nine hundred seventeen thousand, nine hundred forty".