261564201046146 has 16 divisors (see below), whose sum is σ = 535294178885664. Its totient is φ = 85160437549824.

The previous prime is 261564201046139. The next prime is 261564201046147. The reversal of 261564201046146 is 641640102465162.

It is a junction number, because it is equal to n+sod(n) for n = 261564201046095 and 261564201046104.

It is not an unprimeable number, because it can be changed into a prime (261564201046147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506907366111 + ... + 506907366626.

It is an arithmetic number, because the mean of its divisors is an integer number (33455886180354).

Almost surely, 2^{261564201046146} is an apocalyptic number.

261564201046146 is an abundant number, since it is smaller than the sum of its proper divisors (273729977839518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261564201046146 is a wasteful number, since it uses less digits than its factorization.

261564201046146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013814732785.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 261564201046146 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred one million, forty-six thousand, one hundred forty-six".