617651663 has 4 divisors (see below), whose sum is σ = 623767128. Its totient is φ = 611536200.

The previous prime is 617651653. The next prime is 617651681. The reversal of 617651663 is 366156716.

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 617651663 - 2⁴ = 617651647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 617651663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617651653) 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, 3057581 + ... + 3057782.

It is an arithmetic number, because the mean of its divisors is an integer number (155941782).

Almost surely, 2^617651663 is an apocalyptic number.

617651663 is a deficient number, since it is larger than the sum of its proper divisors (6115465).

617651663 is a wasteful number, since it uses less digits than its factorization.

617651663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6115464.

The product of its digits is 136080, while the sum is 41.

The square root of 617651663 is about 24852.5987172368. The cubic root of 617651663 is about 851.6239602021.

The spelling of 617651663 in words is "six hundred seventeen million, six hundred fifty-one thousand, six hundred sixty-three".