661184462551 has 2 divisors, whose sum is σ = 661184462552. Its totient is φ = 661184462550.

The previous prime is 661184462453. The next prime is 661184462621. The reversal of 661184462551 is 155264481166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661184462551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661184462495 and 661184462504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661184460551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330592231275 + 330592231276.

It is an arithmetic number, because the mean of its divisors is an integer number (330592231276).

Almost surely, 2^661184462551 is an apocalyptic number.

661184462551 is a deficient number, since it is larger than the sum of its proper divisors (1).

661184462551 is an equidigital number, since it uses as much as digits as its factorization.

661184462551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382400, while the sum is 49.

The spelling of 661184462551 in words is "six hundred sixty-one billion, one hundred eighty-four million, four hundred sixty-two thousand, five hundred fifty-one".