616421601 has 6 divisors (see below), whose sum is σ = 890386770. Its totient is φ = 410947728.

The previous prime is 616421587. The next prime is 616421609. The reversal of 616421601 is 106124616.

616421601 is a `hidden beast` number, since 6 + 1 + 642 + 16 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 528080400 + 88341201 = 22980^2 + 9399^2 .

It is not a de Polignac number, because 616421601 - 2⁷ = 616421473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (616421609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34245636 + ... + 34245653.

It is an arithmetic number, because the mean of its divisors is an integer number (148397795).

Almost surely, 2^616421601 is an apocalyptic number.

It is an amenable number.

616421601 is a deficient number, since it is larger than the sum of its proper divisors (273965169).

616421601 is a wasteful number, since it uses less digits than its factorization.

616421601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68491295 (or 68491292 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 616421601 is about 24827.8392334089. The cubic root of 616421601 is about 851.0582441150.

The spelling of 616421601 in words is "six hundred sixteen million, four hundred twenty-one thousand, six hundred one".