261857064122 has 8 divisors (see below), whose sum is σ = 393454738656. Its totient is φ = 130705484572.

The previous prime is 261857064107. The next prime is 261857064149. The reversal of 261857064122 is 221460758162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111522278 + ... + 111524625.

It is an arithmetic number, because the mean of its divisors is an integer number (49181842332).

Almost surely, 2^261857064122 is an apocalyptic number.

261857064122 is a deficient number, since it is larger than the sum of its proper divisors (131597674534).

261857064122 is a wasteful number, since it uses less digits than its factorization.

261857064122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223047492.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 261857064122 in words is "two hundred sixty-one billion, eight hundred fifty-seven million, sixty-four thousand, one hundred twenty-two".