6406616651 has 4 divisors (see below), whose sum is σ = 6783476472. Its totient is φ = 6029756832.

The previous prime is 6406616639. The next prime is 6406616653. The reversal of 6406616651 is 1566166046.

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 6406616651 - 2²⁶ = 6339507787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6406616599 and 6406616608.

It is not an unprimeable number, because it can be changed into a prime (6406616653) 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, 188429885 + ... + 188429918.

It is an arithmetic number, because the mean of its divisors is an integer number (1695869118).

Almost surely, 2^6406616651 is an apocalyptic number.

6406616651 is a deficient number, since it is larger than the sum of its proper divisors (376859821).

6406616651 is a wasteful number, since it uses less digits than its factorization.

6406616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376859820.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 6406616651 is about 80041.3433857778. The cubic root of 6406616651 is about 1857.2751416881.

The spelling of 6406616651 in words is "six billion, four hundred six million, six hundred sixteen thousand, six hundred fifty-one".