661184460551 has 2 divisors, whose sum is σ = 661184460552. Its totient is φ = 661184460550.

The previous prime is 661184460539. The next prime is 661184460569. The reversal of 661184460551 is 155064481166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661184460551 - 2⁶ = 661184460487 is a prime.

It is a super-3 number, since 3×661184460551³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661184460496 and 661184460505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661184460151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330592230275 + 330592230276.

It is an arithmetic number, because the mean of its divisors is an integer number (330592230276).

Almost surely, 2^661184460551 is an apocalyptic number.

661184460551 is a deficient number, since it is larger than the sum of its proper divisors (1).

661184460551 is an equidigital number, since it uses as much as digits as its factorization.

661184460551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 661184460551 in words is "six hundred sixty-one billion, one hundred eighty-four million, four hundred sixty thousand, five hundred fifty-one".