71505252001 has 4 divisors (see below), whose sum is σ = 71507002500. Its totient is φ = 71503501504.

The previous prime is 71505251971. The next prime is 71505252011. The reversal of 71505252001 is 10025250517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67881091600 + 3624160401 = 260540^2 + 60201^2 .

It is a cyclic number.

It is not a de Polignac number, because 71505252001 - 2²³ = 71496863393 is a prime.

It is a super-2 number, since 2×71505252001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71505252011) 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, 812476 + ... + 896173.

It is an arithmetic number, because the mean of its divisors is an integer number (17876750625).

Almost surely, 2^71505252001 is an apocalyptic number.

It is an amenable number.

71505252001 is a deficient number, since it is larger than the sum of its proper divisors (1750499).

71505252001 is a wasteful number, since it uses less digits than its factorization.

71505252001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750498.

The product of its (nonzero) digits is 3500, while the sum is 28.

The spelling of 71505252001 in words is "seventy-one billion, five hundred five million, two hundred fifty-two thousand, one".