616651551 has 24 divisors (see below), whose sum is σ = 931582080. Its totient is φ = 392323536.

The previous prime is 616651547. The next prime is 616651573. The reversal of 616651551 is 155156616.

616651551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 616651551 - 2² = 616651547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616251551) 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, 93480 + ... + 99858.

It is an arithmetic number, because the mean of its divisors is an integer number (38815920).

Almost surely, 2^616651551 is an apocalyptic number.

616651551 is a deficient number, since it is larger than the sum of its proper divisors (314930529).

616651551 is a wasteful number, since it uses less digits than its factorization.

616651551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875 (or 6872 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 616651551 is about 24832.4696919175. The cubic root of 616651551 is about 851.1640572540.

The spelling of 616651551 in words is "six hundred sixteen million, six hundred fifty-one thousand, five hundred fifty-one".