29997974071561 has 2 divisors, whose sum is σ = 29997974071562. Its totient is φ = 29997974071560.

The previous prime is 29997974071511. The next prime is 29997974071601. The reversal of 29997974071561 is 16517047979992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28459493545536 + 1538480526025 = 5334744^2 + 1240355^2 .

It is a cyclic number.

It is not a de Polignac number, because 29997974071561 - 2⁷ = 29997974071433 is a prime.

It is not a weakly prime, because it can be changed into another prime (29997974071511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14998987035780 + 14998987035781.

It is an arithmetic number, because the mean of its divisors is an integer number (14998987035781).

Almost surely, 2^{29997974071561} is an apocalyptic number.

It is an amenable number.

29997974071561 is a deficient number, since it is larger than the sum of its proper divisors (1).

29997974071561 is an equidigital number, since it uses as much as digits as its factorization.

29997974071561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540101520, while the sum is 76.

The spelling of 29997974071561 in words is "twenty-nine trillion, nine hundred ninety-seven billion, nine hundred seventy-four million, seventy-one thousand, five hundred sixty-one".