261611047801 has 8 divisors (see below), whose sum is σ = 263205169920. Its totient is φ = 260019386112.

The previous prime is 261611047781. The next prime is 261611047807. The reversal of 261611047801 is 108740116162.

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

It is a cyclic number.

It is not a de Polignac number, because 261611047801 - 2¹⁵ = 261611015033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261611047807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401581 + ... + 827338.

It is an arithmetic number, because the mean of its divisors is an integer number (32900646240).

Almost surely, 2^261611047801 is an apocalyptic number.

It is an amenable number.

261611047801 is a deficient number, since it is larger than the sum of its proper divisors (1594122119).

261611047801 is a wasteful number, since it uses less digits than its factorization.

261611047801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230215.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 261611047801 in words is "two hundred sixty-one billion, six hundred eleven million, forty-seven thousand, eight hundred one".