61515055 has 16 divisors (see below), whose sum is σ = 84985920. Its totient is φ = 41870592.

The previous prime is 61515043. The next prime is 61515071. The reversal of 61515055 is 55051516.

It is a cyclic number.

It is not a de Polignac number, because 61515055 - 2¹¹ = 61513007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1620 + ... + 11209.

It is an arithmetic number, because the mean of its divisors is an integer number (5311620).

Almost surely, 2^61515055 is an apocalyptic number.

61515055 is a deficient number, since it is larger than the sum of its proper divisors (23470865).

61515055 is a wasteful number, since it uses less digits than its factorization.

61515055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 61515055 is about 7843.1533836844. The cubic root of 61515055 is about 394.7545449355.

The spelling of 61515055 in words is "sixty-one million, five hundred fifteen thousand, fifty-five".