65558400987 has 16 divisors (see below), whose sum is σ = 88059479040. Its totient is φ = 43382640000.

The previous prime is 65558400961. The next prime is 65558400991. The reversal of 65558400987 is 78900485556.

It is not a de Polignac number, because 65558400987 - 2¹⁵ = 65558368219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65558400487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75987 + ... + 369987.

It is an arithmetic number, because the mean of its divisors is an integer number (5503717440).

Almost surely, 2^65558400987 is an apocalyptic number.

65558400987 is a deficient number, since it is larger than the sum of its proper divisors (22501078053).

65558400987 is a wasteful number, since it uses less digits than its factorization.

65558400987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294554.

The product of its (nonzero) digits is 12096000, while the sum is 57.

The spelling of 65558400987 in words is "sixty-five billion, five hundred fifty-eight million, four hundred thousand, nine hundred eighty-seven".