65666752525 has 12 divisors (see below), whose sum is σ = 88829207424. Its totient is φ = 47757638000.

The previous prime is 65666752523. The next prime is 65666752537. The reversal of 65666752525 is 52525766656.

It is a happy number.

It is not a de Polignac number, because 65666752525 - 2¹ = 65666752523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666752523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119393821 + ... + 119394370.

It is an arithmetic number, because the mean of its divisors is an integer number (7402433952).

Almost surely, 2^65666752525 is an apocalyptic number.

It is an amenable number.

65666752525 is a deficient number, since it is larger than the sum of its proper divisors (23162454899).

65666752525 is a wasteful number, since it uses less digits than its factorization.

65666752525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238788212 (or 238788207 counting only the distinct ones).

The product of its digits is 22680000, while the sum is 55.

The spelling of 65666752525 in words is "sixty-five billion, six hundred sixty-six million, seven hundred fifty-two thousand, five hundred twenty-five".