65987722251 has 32 divisors (see below), whose sum is σ = 106692215040. Its totient is φ = 39975537600.

The previous prime is 65987722243. The next prime is 65987722313. The reversal of 65987722251 is 15222778956.

65987722251 is a `hidden beast` number, since 6 + 598 + 7 + 7 + 22 + 25 + 1 = 666.

It is not a de Polignac number, because 65987722251 - 2³ = 65987722243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65987722211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 669991 + ... + 762143.

It is an arithmetic number, because the mean of its divisors is an integer number (3334131720).

Almost surely, 2^65987722251 is an apocalyptic number.

65987722251 is a deficient number, since it is larger than the sum of its proper divisors (40704492789).

65987722251 is a wasteful number, since it uses less digits than its factorization.

65987722251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94584 (or 94578 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 65987722251 in words is "sixty-five billion, nine hundred eighty-seven million, seven hundred twenty-two thousand, two hundred fifty-one".