61215256107 has 12 divisors (see below), whose sum is σ = 90578672184. Its totient is φ = 39814800480.

The previous prime is 61215256057. The next prime is 61215256159. The reversal of 61215256107 is 70165251216.

61215256107 is a `hidden beast` number, since 6 + 1 + 2 + 15 + 25 + 610 + 7 = 666.

61215256107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61215256107 - 2¹⁰ = 61215255083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61215256807) 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, 82947133 + ... + 82947870.

It is an arithmetic number, because the mean of its divisors is an integer number (7548222682).

Almost surely, 2^61215256107 is an apocalyptic number.

61215256107 is a deficient number, since it is larger than the sum of its proper divisors (29363416077).

61215256107 is a wasteful number, since it uses less digits than its factorization.

61215256107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165895050 (or 165895047 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 61215256107 in words is "sixty-one billion, two hundred fifteen million, two hundred fifty-six thousand, one hundred seven".