50642664985 has 16 divisors (see below), whose sum is σ = 67837619520. Its totient is φ = 35974491840.

The previous prime is 50642664911. The next prime is 50642665009. The reversal of 50642664985 is 58946624605.

It is not a de Polignac number, because 50642664985 - 2¹³ = 50642656793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

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, 10704330 + ... + 10709059.

It is an arithmetic number, because the mean of its divisors is an integer number (4239851220).

Almost surely, 2^50642664985 is an apocalyptic number.

50642664985 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

50642664985 is a deficient number, since it is larger than the sum of its proper divisors (17194954535).

50642664985 is a wasteful number, since it uses less digits than its factorization.

50642664985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21413448.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 50642664985 in words is "fifty billion, six hundred forty-two million, six hundred sixty-four thousand, nine hundred eighty-five".