651315865 has 16 divisors (see below), whose sum is σ = 793997568. Its totient is φ = 512836416.

The previous prime is 651315823. The next prime is 651315881. The reversal of 651315865 is 568513156.

It is a cyclic number.

It is not a de Polignac number, because 651315865 - 2¹⁵ = 651283097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82219 + ... + 89791.

It is an arithmetic number, because the mean of its divisors is an integer number (49624848).

Almost surely, 2^651315865 is an apocalyptic number.

It is an amenable number.

651315865 is a deficient number, since it is larger than the sum of its proper divisors (142681703).

651315865 is a wasteful number, since it uses less digits than its factorization.

651315865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848.

The product of its digits is 108000, while the sum is 40.

The square root of 651315865 is about 25520.8907563980. The cubic root of 651315865 is about 866.8232517040.

The spelling of 651315865 in words is "six hundred fifty-one million, three hundred fifteen thousand, eight hundred sixty-five".