261562722004642 has 8 divisors (see below), whose sum is σ = 393114896531100. Its totient is φ = 130524423160944.

The previous prime is 261562722004621. The next prime is 261562722004681. The reversal of 261562722004642 is 246400227265162.

It can be written as a sum of positive squares in 2 ways, for example, as 260762393163321 + 800328841321 = 16148139^2 + 894611^2 .

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

It is a super-2 number, since 2×261562722004642² (a number of 30 digits) contains 22 as substring.

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, 128468919417 + ... + 128468921452.

Almost surely, 2^{261562722004642} is an apocalyptic number.

261562722004642 is a deficient number, since it is larger than the sum of its proper divisors (131552174526458).

261562722004642 is a wasteful number, since it uses less digits than its factorization.

261562722004642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256937841380.

The product of its (nonzero) digits is 3870720, while the sum is 49.

The spelling of 261562722004642 in words is "two hundred sixty-one trillion, five hundred sixty-two billion, seven hundred twenty-two million, four thousand, six hundred forty-two".