616722651 has 12 divisors (see below), whose sum is σ = 943223112. Its totient is φ = 386963136.

The previous prime is 616722637. The next prime is 616722703. The reversal of 616722651 is 156227616.

It is a happy number.

It is not a de Polignac number, because 616722651 - 2⁷ = 616722523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (616722251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2015281 + ... + 2015586.

It is an arithmetic number, because the mean of its divisors is an integer number (78601926).

Almost surely, 2^616722651 is an apocalyptic number.

616722651 is a deficient number, since it is larger than the sum of its proper divisors (326500461).

616722651 is a wasteful number, since it uses less digits than its factorization.

616722651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030890 (or 4030887 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 616722651 is about 24833.9012440655. The cubic root of 616722651 is about 851.1967691038.

The spelling of 616722651 in words is "six hundred sixteen million, seven hundred twenty-two thousand, six hundred fifty-one".