654561639929 has 2 divisors, whose sum is σ = 654561639930. Its totient is φ = 654561639928.

The previous prime is 654561639883. The next prime is 654561639959. The reversal of 654561639929 is 929936165456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486582978025 + 167978661904 = 697555^2 + 409852^2 .

It is a cyclic number.

It is not a de Polignac number, because 654561639929 - 2⁸ = 654561639673 is a prime.

It is not a weakly prime, because it can be changed into another prime (654561639959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327280819964 + 327280819965.

It is an arithmetic number, because the mean of its divisors is an integer number (327280819965).

Almost surely, 2^654561639929 is an apocalyptic number.

It is an amenable number.

654561639929 is a deficient number, since it is larger than the sum of its proper divisors (1).

654561639929 is an equidigital number, since it uses as much as digits as its factorization.

654561639929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94478400, while the sum is 65.

The spelling of 654561639929 in words is "six hundred fifty-four billion, five hundred sixty-one million, six hundred thirty-nine thousand, nine hundred twenty-nine".