261543670610662 has 64 divisors (see below), whose sum is σ = 463794691497984. Its totient is φ = 109412349409440.

The previous prime is 261543670610623. The next prime is 261543670610669. The reversal of 261543670610662 is 266016076345162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261543670610669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88247998 + ... + 91163569.

It is an arithmetic number, because the mean of its divisors is an integer number (7246792054656).

Almost surely, 2^{261543670610662} is an apocalyptic number.

261543670610662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261543670610662 is a deficient number, since it is larger than the sum of its proper divisors (202251020887322).

261543670610662 is a wasteful number, since it uses less digits than its factorization.

261543670610662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179411713.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 261543670610662 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy million, six hundred ten thousand, six hundred sixty-two".