165724401451 has 8 divisors (see below), whose sum is σ = 200540452320. Its totient is φ = 133693634688.

The previous prime is 165724401391. The next prime is 165724401509. The reversal of 165724401451 is 154104427561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165724401451 - 2¹³ = 165724393259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165724401151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696320896 + ... + 696321133.

It is an arithmetic number, because the mean of its divisors is an integer number (25067556540).

Almost surely, 2^165724401451 is an apocalyptic number.

165724401451 is a deficient number, since it is larger than the sum of its proper divisors (34816050869).

165724401451 is a wasteful number, since it uses less digits than its factorization.

165724401451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392642053.

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 165724401451 in words is "one hundred sixty-five billion, seven hundred twenty-four million, four hundred one thousand, four hundred fifty-one".