73537661 has 4 divisors (see below), whose sum is σ = 73576800. Its totient is φ = 73498524.

The previous prime is 73537643. The next prime is 73537679. The reversal of 73537661 is 16673537.

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: 16673537 = 103 ⋅161879.

It is an interprime number because it is at equal distance from previous prime (73537643) and next prime (73537679).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73537661 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 (73537621) 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, 16601 + ... + 20558.

It is an arithmetic number, because the mean of its divisors is an integer number (18394200).

Almost surely, 2^73537661 is an apocalyptic number.

It is an amenable number.

73537661 is a deficient number, since it is larger than the sum of its proper divisors (39139).

73537661 is a wasteful number, since it uses less digits than its factorization.

73537661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39138.

The product of its digits is 79380, while the sum is 38.

The square root of 73537661 is about 8575.4102525768. The cubic root of 73537661 is about 418.9574691538.

The spelling of 73537661 in words is "seventy-three million, five hundred thirty-seven thousand, six hundred sixty-one".