133242757661 has 16 divisors (see below), whose sum is σ = 151472408640. Its totient is φ = 116189821440.

The previous prime is 133242757649. The next prime is 133242757789. The reversal of 133242757661 is 166757242331.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-133242757661 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 (133242757061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 676895 + ... + 851276.

It is an arithmetic number, because the mean of its divisors is an integer number (9467025540).

Almost surely, 2^133242757661 is an apocalyptic number.

It is an amenable number.

133242757661 is a deficient number, since it is larger than the sum of its proper divisors (18229650979).

133242757661 is a wasteful number, since it uses less digits than its factorization.

133242757661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528556.

The product of its digits is 1270080, while the sum is 47.

Adding to 133242757661 its reverse (166757242331), we get a palindrome (299999999992).

The spelling of 133242757661 in words is "one hundred thirty-three billion, two hundred forty-two million, seven hundred fifty-seven thousand, six hundred sixty-one".