51615201655505 has 16 divisors (see below), whose sum is σ = 64077318881280. Its totient is φ = 39866255636928.

The previous prime is 51615201655489. The next prime is 51615201655531. The reversal of 51615201655505 is 50555610251615.

It is a cyclic number.

It is not a de Polignac number, because 51615201655505 - 2⁴ = 51615201655489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51615201655505.

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, 6249137 + ... + 11928206.

It is an arithmetic number, because the mean of its divisors is an integer number (4004832430080).

Almost surely, 2^{51615201655505} is an apocalyptic number.

It is an amenable number.

51615201655505 is a deficient number, since it is larger than the sum of its proper divisors (12462117225775).

51615201655505 is a wasteful number, since it uses less digits than its factorization.

51615201655505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18196960.

The product of its (nonzero) digits is 1125000, while the sum is 47.

The spelling of 51615201655505 in words is "fifty-one trillion, six hundred fifteen billion, two hundred one million, six hundred fifty-five thousand, five hundred five".