403630251561 has 12 divisors (see below), whose sum is σ = 583133899140. Its totient is φ = 269034946080.

The previous prime is 403630251559. The next prime is 403630251593. The reversal of 403630251561 is 165152036304.

403630251561 is a `hidden beast` number, since 4 + 0 + 3 + 630 + 2 + 5 + 15 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 345232629225 + 58397622336 = 587565^2 + 241656^2 .

It is not a de Polignac number, because 403630251561 - 2¹ = 403630251559 is a prime.

It is a super-2 number, since 2×403630251561² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (403630251061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4274730 + ... + 4368131.

It is an arithmetic number, because the mean of its divisors is an integer number (48594491595).

Almost surely, 2^403630251561 is an apocalyptic number.

It is an amenable number.

403630251561 is a deficient number, since it is larger than the sum of its proper divisors (179503647579).

403630251561 is a wasteful number, since it uses less digits than its factorization.

403630251561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8648056 (or 8648053 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 403630251561 its reverse (165152036304), we get a palindrome (568782287865).

The spelling of 403630251561 in words is "four hundred three billion, six hundred thirty million, two hundred fifty-one thousand, five hundred sixty-one".