865016551 has 24 divisors (see below), whose sum is σ = 1029036960. Its totient is φ = 724756032.

The previous prime is 865016513. The next prime is 865016563. The reversal of 865016551 is 155610568.

It is not a de Polignac number, because 865016551 - 2¹⁷ = 864885479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 865016551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865016651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1030590 + ... + 1031428.

It is an arithmetic number, because the mean of its divisors is an integer number (42876540).

Almost surely, 2^865016551 is an apocalyptic number.

865016551 is a deficient number, since it is larger than the sum of its proper divisors (164020409).

865016551 is a wasteful number, since it uses less digits than its factorization.

865016551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 865016551 is about 29411.1637138009. The cubic root of 865016551 is about 952.8140204579.

The spelling of 865016551 in words is "eight hundred sixty-five million, sixteen thousand, five hundred fifty-one".