61501565525 has 12 divisors (see below), whose sum is σ = 76342500672. Its totient is φ = 49149278640.

The previous prime is 61501565513. The next prime is 61501565549. The reversal of 61501565525 is 52556510516.

It is a happy number.

It is not a de Polignac number, because 61501565525 - 2²⁶ = 61434456661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1275197 + ... + 1322546.

It is an arithmetic number, because the mean of its divisors is an integer number (6361875056).

Almost surely, 2^61501565525 is an apocalyptic number.

It is an amenable number.

61501565525 is a deficient number, since it is larger than the sum of its proper divisors (14840935147).

61501565525 is a wasteful number, since it uses less digits than its factorization.

61501565525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598700 (or 2598695 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 61501565525 in words is "sixty-one billion, five hundred one million, five hundred sixty-five thousand, five hundred twenty-five".