71251505964 has 18 divisors (see below), whose sum is σ = 180107973500. Its totient is φ = 23750501976.

The previous prime is 71251505953. The next prime is 71251505977. The reversal of 71251505964 is 46950515217.

It is a happy number.

71251505964 is a `hidden beast` number, since 7 + 1 + 2 + 5 + 1 + 50 + 596 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 989604214 + ... + 989604285.

Almost surely, 2^71251505964 is an apocalyptic number.

It is an amenable number.

71251505964 is an abundant number, since it is smaller than the sum of its proper divisors (108856467536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71251505964 is a wasteful number, since it uses less digits than its factorization.

71251505964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979208509 (or 1979208504 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 71251505964 in words is "seventy-one billion, two hundred fifty-one million, five hundred five thousand, nine hundred sixty-four".