261770521894603 has 2 divisors, whose sum is σ = 261770521894604. Its totient is φ = 261770521894602.

The previous prime is 261770521894543. The next prime is 261770521894691. The reversal of 261770521894603 is 306498125077162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261770521894603 - 2²⁹ = 261769985023691 is a prime.

It is a super-2 number, since 2×261770521894603² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261770521891603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130885260947301 + 130885260947302.

It is an arithmetic number, because the mean of its divisors is an integer number (130885260947302).

It is a 2-persistent number, because it is pandigital, and so is 2⋅261770521894603 = 523541043789206, but 3⋅261770521894603 = 785311565683809 is not.

Almost surely, 2^{261770521894603} is an apocalyptic number.

261770521894603 is a deficient number, since it is larger than the sum of its proper divisors (1).

261770521894603 is an equidigital number, since it uses as much as digits as its factorization.

261770521894603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 261770521894603 in words is "two hundred sixty-one trillion, seven hundred seventy billion, five hundred twenty-one million, eight hundred ninety-four thousand, six hundred three".