133557031506 has 16 divisors (see below), whose sum is σ = 267139626048. Its totient is φ = 44514750000.

The previous prime is 133557031481. The next prime is 133557031579. The reversal of 133557031506 is 605130755331.

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, 996870 + ... + 1122881.

It is an arithmetic number, because the mean of its divisors is an integer number (16696226628).

Almost surely, 2^133557031506 is an apocalyptic number.

133557031506 is an abundant number, since it is smaller than the sum of its proper divisors (133582594542).

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

133557031506 is a wasteful number, since it uses less digits than its factorization.

133557031506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130257.

The product of its (nonzero) digits is 141750, while the sum is 39.

Adding to 133557031506 its reverse (605130755331), we get a palindrome (738687786837).

The spelling of 133557031506 in words is "one hundred thirty-three billion, five hundred fifty-seven million, thirty-one thousand, five hundred six".