61211105515 has 12 divisors (see below), whose sum is σ = 85445706816. Its totient is φ = 41973329328.

The previous prime is 61211105447. The next prime is 61211105531. The reversal of 61211105515 is 51550111216.

It is not a de Polignac number, because 61211105515 - 2¹¹ = 61211103467 is a prime.

It is a Duffinian 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, 124920379 + ... + 124920868.

It is an arithmetic number, because the mean of its divisors is an integer number (7120475568).

Almost surely, 2^61211105515 is an apocalyptic number.

61211105515 is a deficient number, since it is larger than the sum of its proper divisors (24234601301).

61211105515 is a wasteful number, since it uses less digits than its factorization.

61211105515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249841266 (or 249841259 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 28.

The spelling of 61211105515 in words is "sixty-one billion, two hundred eleven million, one hundred five thousand, five hundred fifteen".