651556945 has 8 divisors (see below), whose sum is σ = 842012136. Its totient is φ = 481149696.

The previous prime is 651556933. The next prime is 651556967. The reversal of 651556945 is 549655156.

It can be written as a sum of positive squares in 4 ways, for example, as 91240704 + 560316241 = 9552^2 + 23671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651556945 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651556895 and 651556904.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5011912 + ... + 5012041.

It is an arithmetic number, because the mean of its divisors is an integer number (105251517).

Almost surely, 2^651556945 is an apocalyptic number.

651556945 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

651556945 is a deficient number, since it is larger than the sum of its proper divisors (190455191).

651556945 is a wasteful number, since it uses less digits than its factorization.

651556945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10023971.

The product of its digits is 810000, while the sum is 46.

The square root of 651556945 is about 25525.6135087876. The cubic root of 651556945 is about 866.9301880271.

The spelling of 651556945 in words is "six hundred fifty-one million, five hundred fifty-six thousand, nine hundred forty-five".