261555266042 has 16 divisors (see below), whose sum is σ = 451131260352. Its totient is φ = 111407412960.

The previous prime is 261555266039. The next prime is 261555266069. The reversal of 261555266042 is 240662555162.

It is a super-2 number, since 2×261555266042² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261555265984 and 261555266002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57306059 + ... + 57310622.

It is an arithmetic number, because the mean of its divisors is an integer number (28195703772).

Almost surely, 2^261555266042 is an apocalyptic number.

261555266042 is a deficient number, since it is larger than the sum of its proper divisors (189575994310).

261555266042 is a wasteful number, since it uses less digits than its factorization.

261555266042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114616853.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 261555266042 in words is "two hundred sixty-one billion, five hundred fifty-five million, two hundred sixty-six thousand, forty-two".