73661153 has 4 divisors (see below), whose sum is σ = 77994180. Its totient is φ = 69328128.

The previous prime is 73661141. The next prime is 73661183. The reversal of 73661153 is 35116637.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41319184 + 32341969 = 6428^2 + 5687^2 .

It is a cyclic number.

It is not a de Polignac number, because 73661153 - 2⁸ = 73660897 is a prime.

It is a super-2 number, since 2×73661153² = 10851930922578818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73661113) 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, 2166488 + ... + 2166521.

It is an arithmetic number, because the mean of its divisors is an integer number (19498545).

Almost surely, 2^73661153 is an apocalyptic number.

It is an amenable number.

73661153 is a deficient number, since it is larger than the sum of its proper divisors (4333027).

73661153 is a wasteful number, since it uses less digits than its factorization.

73661153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333026.

The product of its digits is 11340, while the sum is 32.

The square root of 73661153 is about 8582.6075874410. The cubic root of 73661153 is about 419.1918568171.

The spelling of 73661153 in words is "seventy-three million, six hundred sixty-one thousand, one hundred fifty-three".