261755570642 has 8 divisors (see below), whose sum is σ = 397363878576. Its totient is φ = 129300944452.

The previous prime is 261755570641. The next prime is 261755570647. The reversal of 261755570642 is 246075557162.

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

It is not an unprimeable number, because it can be changed into a prime (261755570641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788420228 + ... + 788420559.

It is an arithmetic number, because the mean of its divisors is an integer number (49670484822).

Almost surely, 2^261755570642 is an apocalyptic number.

261755570642 is a deficient number, since it is larger than the sum of its proper divisors (135608307934).

261755570642 is a wasteful number, since it uses less digits than its factorization.

261755570642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576840872.

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 261755570642 in words is "two hundred sixty-one billion, seven hundred fifty-five million, five hundred seventy thousand, six hundred forty-two".