61312540015 has 16 divisors (see below), whose sum is σ = 73999519776. Its totient is φ = 48767184000.

The previous prime is 61312539997. The next prime is 61312540021. The reversal of 61312540015 is 51004521316.

It is not a de Polignac number, because 61312540015 - 2⁷ = 61312539887 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 7327224 + ... + 7335586.

It is an arithmetic number, because the mean of its divisors is an integer number (4624969986).

Almost surely, 2^61312540015 is an apocalyptic number.

61312540015 is a deficient number, since it is larger than the sum of its proper divisors (12686979761).

61312540015 is a wasteful number, since it uses less digits than its factorization.

61312540015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 61312540015 in words is "sixty-one billion, three hundred twelve million, five hundred forty thousand, fifteen".