133768532538 has 16 divisors (see below), whose sum is σ = 297263405760. Its totient is φ = 44589510828.

The previous prime is 133768532461. The next prime is 133768532549. The reversal of 133768532538 is 835235867331.

133768532538 is a `hidden beast` number, since 1 + 3 + 3 + 76 + 8 + 5 + 32 + 538 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 2477195047 = 133768532538 / (1 + 3 + 3 + 7 + 6 + 8 + 5 + 3 + 2 + 5 + 3 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1238597470 + ... + 1238597577.

It is an arithmetic number, because the mean of its divisors is an integer number (18578962860).

Almost surely, 2^133768532538 is an apocalyptic number.

133768532538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

133768532538 is an abundant number, since it is smaller than the sum of its proper divisors (163494873222).

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

133768532538 is a wasteful number, since it uses less digits than its factorization.

133768532538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477195058 (or 2477195052 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 133768532538 in words is "one hundred thirty-three billion, seven hundred sixty-eight million, five hundred thirty-two thousand, five hundred thirty-eight".