11737473721 has 4 divisors (see below), whose sum is σ = 11737746000. Its totient is φ = 11737201444.

The previous prime is 11737473719. The next prime is 11737473733. The reversal of 11737473721 is 12737473711.

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 cyclic number.

It is not a de Polignac number, because 11737473721 - 2¹ = 11737473719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11737473221) 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, 55591 + ... + 162988.

It is an arithmetic number, because the mean of its divisors is an integer number (2934436500).

Almost surely, 2^11737473721 is an apocalyptic number.

It is an amenable number.

11737473721 is a deficient number, since it is larger than the sum of its proper divisors (272279).

11737473721 is an equidigital number, since it uses as much as digits as its factorization.

11737473721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272278.

The product of its digits is 172872, while the sum is 43.

The spelling of 11737473721 in words is "eleven billion, seven hundred thirty-seven million, four hundred seventy-three thousand, seven hundred twenty-one".