205420153501501 has 2 divisors, whose sum is σ = 205420153501502. Its totient is φ = 205420153501500.

The previous prime is 205420153501487. The next prime is 205420153501513. The reversal of 205420153501501 is 105105351024502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158188223744100 + 47231929757401 = 12577290^2 + 6872549^2 .

It is a cyclic number.

It is not a de Polignac number, because 205420153501501 - 2¹⁷ = 205420153370429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205420153501601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102710076750750 + 102710076750751.

It is an arithmetic number, because the mean of its divisors is an integer number (102710076750751).

Almost surely, 2^{205420153501501} is an apocalyptic number.

It is an amenable number.

205420153501501 is a deficient number, since it is larger than the sum of its proper divisors (1).

205420153501501 is an equidigital number, since it uses as much as digits as its factorization.

205420153501501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 205420153501501 in words is "two hundred five trillion, four hundred twenty billion, one hundred fifty-three million, five hundred one thousand, five hundred one".