616615566551 has 4 divisors (see below), whose sum is σ = 616909335000. Its totient is φ = 616321798104.

The previous prime is 616615566509. The next prime is 616615566631. The reversal of 616615566551 is 155665516616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616615566551 - 2¹⁸ = 616615304407 is a prime.

It is a super-3 number, since 3×616615566551³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616615566493 and 616615566502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616615562551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146881076 + ... + 146885273.

It is an arithmetic number, because the mean of its divisors is an integer number (154227333750).

Almost surely, 2^616615566551 is an apocalyptic number.

616615566551 is a deficient number, since it is larger than the sum of its proper divisors (293768449).

616615566551 is a wasteful number, since it uses less digits than its factorization.

616615566551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293768448.

The product of its digits is 4860000, while the sum is 53.

The spelling of 616615566551 in words is "six hundred sixteen billion, six hundred fifteen million, five hundred sixty-six thousand, five hundred fifty-one".