15532020111997 has 2 divisors, whose sum is σ = 15532020111998. Its totient is φ = 15532020111996.

The previous prime is 15532020111973. The next prime is 15532020112019. The reversal of 15532020111997 is 79911102023551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15035518084356 + 496502027641 = 3877566^2 + 704629^2 .

It is a cyclic number.

It is not a de Polignac number, because 15532020111997 - 2¹⁵ = 15532020079229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15532020111917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7766010055998 + 7766010055999.

It is an arithmetic number, because the mean of its divisors is an integer number (7766010055999).

Almost surely, 2^{15532020111997} is an apocalyptic number.

It is an amenable number.

15532020111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15532020111997 is an equidigital number, since it uses as much as digits as its factorization.

15532020111997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 46.

The spelling of 15532020111997 in words is "fifteen trillion, five hundred thirty-two billion, twenty million, one hundred eleven thousand, nine hundred ninety-seven".