55000661515 has 32 divisors (see below), whose sum is σ = 69064519680. Its totient is φ = 41994578304.

The previous prime is 55000661479. The next prime is 55000661519. The reversal of 55000661515 is 51516600055.

It is a cyclic number.

It is not a de Polignac number, because 55000661515 - 2⁹ = 55000661003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55000661519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9062512 + ... + 9068578.

It is an arithmetic number, because the mean of its divisors is an integer number (2158266240).

Almost surely, 2^55000661515 is an apocalyptic number.

55000661515 is a deficient number, since it is larger than the sum of its proper divisors (14063858165).

55000661515 is a wasteful number, since it uses less digits than its factorization.

55000661515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6811.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 55000661515 in words is "fifty-five billion, six hundred sixty-one thousand, five hundred fifteen".