651355451816 has 8 divisors (see below), whose sum is σ = 1221291472170. Its totient is φ = 325677725904.

The previous prime is 651355451771. The next prime is 651355451833. The reversal of 651355451816 is 618154553156.

It can be written as a sum of positive squares in only one way, i.e., 644407562500 + 6947889316 = 802750^2 + 83354^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×651355451816² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40709715731 + ... + 40709715746.

Almost surely, 2^651355451816 is an apocalyptic number.

It is an amenable number.

651355451816 is a deficient number, since it is larger than the sum of its proper divisors (569936020354).

651355451816 is a wasteful number, since it uses less digits than its factorization.

651355451816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81419431483 (or 81419431479 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 50.

The spelling of 651355451816 in words is "six hundred fifty-one billion, three hundred fifty-five million, four hundred fifty-one thousand, eight hundred sixteen".