71320621501 has 4 divisors (see below), whose sum is σ = 74421518112. Its totient is φ = 68219724892.

The previous prime is 71320621469. The next prime is 71320621529. The reversal of 71320621501 is 10512602317.

It is a happy number.

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 71320621501 - 2⁵ = 71320621469 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 71320621501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71320621201) 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, 1550448271 + ... + 1550448316.

It is an arithmetic number, because the mean of its divisors is an integer number (18605379528).

Almost surely, 2^71320621501 is an apocalyptic number.

It is an amenable number.

71320621501 is a deficient number, since it is larger than the sum of its proper divisors (3100896611).

71320621501 is a wasteful number, since it uses less digits than its factorization.

71320621501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100896610.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 71320621501 in words is "seventy-one billion, three hundred twenty million, six hundred twenty-one thousand, five hundred one".