153504661 has 4 divisors (see below), whose sum is σ = 154939392. Its totient is φ = 152069932.

The previous prime is 153504649. The next prime is 153504671. The reversal of 153504661 is 166405351.

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: 166405351 = 7 ⋅23772193.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-153504661 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153504671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717205 + ... + 717418.

It is an arithmetic number, because the mean of its divisors is an integer number (38734848).

Almost surely, 2^153504661 is an apocalyptic number.

It is an amenable number.

153504661 is a deficient number, since it is larger than the sum of its proper divisors (1434731).

153504661 is a wasteful number, since it uses less digits than its factorization.

153504661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434730.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 153504661 is about 12389.6997945874. The cubic root of 153504661 is about 535.4355331951.

The spelling of 153504661 in words is "one hundred fifty-three million, five hundred four thousand, six hundred sixty-one".