651561124401 has 18 divisors (see below), whose sum is σ = 1034480427890. Its totient is φ = 394885529280.

The previous prime is 651561124363. The next prime is 651561124429. The reversal of 651561124401 is 104421165156.

651561124401 is a `hidden beast` number, since 6 + 5 + 15 + 611 + 24 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 498718440000 + 152842684401 = 706200^2 + 390951^2 .

It is not a de Polignac number, because 651561124401 - 2³¹ = 649413640753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651561124481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 299154616 + ... + 299156793.

Almost surely, 2^651561124401 is an apocalyptic number.

It is an amenable number.

651561124401 is a deficient number, since it is larger than the sum of its proper divisors (382919303489).

651561124401 is a wasteful number, since it uses less digits than its factorization.

651561124401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598311437 (or 598311423 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 651561124401 its reverse (104421165156), we get a palindrome (755982289557).

The spelling of 651561124401 in words is "six hundred fifty-one billion, five hundred sixty-one million, one hundred twenty-four thousand, four hundred one".