73666315657 has 4 divisors (see below), whose sum is σ = 80363253456. Its totient is φ = 66969377860.

The previous prime is 73666315651. The next prime is 73666315673. The reversal of 73666315657 is 75651366637.

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.

It is a de Polignac number, because none of the positive numbers 2^k-73666315657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73666315598 and 73666315607.

It is not an unprimeable number, because it can be changed into a prime (73666315651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3348468883 + ... + 3348468904.

It is an arithmetic number, because the mean of its divisors is an integer number (20090813364).

Almost surely, 2^73666315657 is an apocalyptic number.

It is an amenable number.

73666315657 is a deficient number, since it is larger than the sum of its proper divisors (6696937799).

73666315657 is a wasteful number, since it uses less digits than its factorization.

73666315657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696937798.

The product of its digits is 14288400, while the sum is 55.

The spelling of 73666315657 in words is "seventy-three billion, six hundred sixty-six million, three hundred fifteen thousand, six hundred fifty-seven".