61287678216 has 64 divisors (see below), whose sum is σ = 170660040000. Its totient is φ = 20379247488.

The previous prime is 61287678169. The next prime is 61287678227.

61287678216 is a `hidden beast` number, since 612 + 8 + 7 + 6 + 7 + 8 + 2 + 16 = 666.

61287678216 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×61287678216² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258526 + ... + 435213.

It is an arithmetic number, because the mean of its divisors is an integer number (2666563125).

Almost surely, 2^61287678216 is an apocalyptic number.

It is an amenable number.

61287678216 is an abundant number, since it is smaller than the sum of its proper divisors (109372361784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61287678216 is a wasteful number, since it uses less digits than its factorization.

61287678216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694163 (or 694153 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 61287678216 in words is "sixty-one billion, two hundred eighty-seven million, six hundred seventy-eight thousand, two hundred sixteen".