133721147557 has 4 divisors (see below), whose sum is σ = 134970878016. Its totient is φ = 132471417100.

The previous prime is 133721147473. The next prime is 133721147563. The reversal of 133721147557 is 755741127331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755741127331 = 677 ⋅1116308903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133721147557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133721127557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624865069 + ... + 624865282.

It is an arithmetic number, because the mean of its divisors is an integer number (33742719504).

Almost surely, 2^133721147557 is an apocalyptic number.

It is an amenable number.

133721147557 is a deficient number, since it is larger than the sum of its proper divisors (1249730459).

133721147557 is a wasteful number, since it uses less digits than its factorization.

133721147557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249730458.

The product of its digits is 617400, while the sum is 46.

The spelling of 133721147557 in words is "one hundred thirty-three billion, seven hundred twenty-one million, one hundred forty-seven thousand, five hundred fifty-seven".