261612166235 has 16 divisors (see below), whose sum is σ = 379887247296. Its totient is φ = 168838775808.

The previous prime is 261612166117. The next prime is 261612166273. The reversal of 261612166235 is 532661216162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261612166235 - 2²⁴ = 261595389019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261612166192 and 261612166201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219841562 + ... + 219842751.

It is an arithmetic number, because the mean of its divisors is an integer number (23742952956).

Almost surely, 2^261612166235 is an apocalyptic number.

261612166235 is a deficient number, since it is larger than the sum of its proper divisors (118275081061).

261612166235 is a wasteful number, since it uses less digits than its factorization.

261612166235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439684342.

The product of its digits is 155520, while the sum is 41.

The spelling of 261612166235 in words is "two hundred sixty-one billion, six hundred twelve million, one hundred sixty-six thousand, two hundred thirty-five".