616661556511 has 64 divisors (see below), whose sum is σ = 832035456000. Its totient is φ = 441378201600.

The previous prime is 616661556457. The next prime is 616661556523. The reversal of 616661556511 is 115655166616.

It is not a de Polignac number, because 616661556511 - 2²⁵ = 616628002079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616661556211) 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 63 ways as a sum of consecutive naturals, for example, 189216400 + ... + 189219658.

It is an arithmetic number, because the mean of its divisors is an integer number (13000554000).

Almost surely, 2^616661556511 is an apocalyptic number.

616661556511 is a deficient number, since it is larger than the sum of its proper divisors (215373899489).

616661556511 is a wasteful number, since it uses less digits than its factorization.

616661556511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its digits is 972000, while the sum is 49.

The spelling of 616661556511 in words is "six hundred sixteen billion, six hundred sixty-one million, five hundred fifty-six thousand, five hundred eleven".