65615541251 has 4 divisors (see below), whose sum is σ = 70662890592. Its totient is φ = 60568191912.

The previous prime is 65615541197. The next prime is 65615541269. The reversal of 65615541251 is 15214551656.

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

It is a cyclic number.

It is not a de Polignac number, because 65615541251 - 2¹⁰ = 65615540227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65615541199 and 65615541208.

It is not an unprimeable number, because it can be changed into a prime (65615541451) 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, 2523674651 + ... + 2523674676.

It is an arithmetic number, because the mean of its divisors is an integer number (17665722648).

Almost surely, 2^65615541251 is an apocalyptic number.

65615541251 is a deficient number, since it is larger than the sum of its proper divisors (5047349341).

65615541251 is a wasteful number, since it uses less digits than its factorization.

65615541251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047349340.

The product of its digits is 180000, while the sum is 41.

The spelling of 65615541251 in words is "sixty-five billion, six hundred fifteen million, five hundred forty-one thousand, two hundred fifty-one".