55616666679 has 24 divisors (see below), whose sum is σ = 93946799232. Its totient is φ = 31041858960.

The previous prime is 55616666629. The next prime is 55616666719. The reversal of 55616666679 is 97666661655.

It is a happy number.

It is not a de Polignac number, because 55616666679 - 2⁹ = 55616666167 is a prime.

It is a super-2 number, since 2×55616666679² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55616666629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10262457 + ... + 10267874.

It is an arithmetic number, because the mean of its divisors is an integer number (3914449968).

Almost surely, 2^55616666679 is an apocalyptic number.

55616666679 is a deficient number, since it is larger than the sum of its proper divisors (38330132553).

55616666679 is a wasteful number, since it uses less digits than its factorization.

55616666679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20530387 (or 20530384 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 63.

The spelling of 55616666679 in words is "fifty-five billion, six hundred sixteen million, six hundred sixty-six thousand, six hundred seventy-nine".