153945373721 has 8 divisors (see below), whose sum is σ = 155522534664. Its totient is φ = 152369251200.

The previous prime is 153945373709. The next prime is 153945373793. The reversal of 153945373721 is 127373549351.

It can be written as a sum of positive squares in 4 ways, for example, as 111131556496 + 42813817225 = 333364^2 + 206915^2 .

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 153945373721 - 2⁶ = 153945373657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 153945373721.

It is not an unprimeable number, because it can be changed into a prime (153945370721) 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, 40175 + ... + 556331.

It is an arithmetic number, because the mean of its divisors is an integer number (19440316833).

Almost surely, 2^153945373721 is an apocalyptic number.

It is an amenable number.

153945373721 is a deficient number, since it is larger than the sum of its proper divisors (1577160943).

153945373721 is a wasteful number, since it uses less digits than its factorization.

153945373721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519211.

The product of its digits is 2381400, while the sum is 50.

The spelling of 153945373721 in words is "one hundred fifty-three billion, nine hundred forty-five million, three hundred seventy-three thousand, seven hundred twenty-one".