261040537651 has 8 divisors (see below), whose sum is σ = 263616825024. Its totient is φ = 258466781160.

The previous prime is 261040537619. The next prime is 261040537657. The reversal of 261040537651 is 156735040162.

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 261040537651 - 2⁵ = 261040537619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261040537657) 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, 425085 + ... + 838318.

It is an arithmetic number, because the mean of its divisors is an integer number (32952103128).

Almost surely, 2^261040537651 is an apocalyptic number.

261040537651 is a deficient number, since it is larger than the sum of its proper divisors (2576287373).

261040537651 is a wasteful number, since it uses less digits than its factorization.

261040537651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265441.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 261040537651 in words is "two hundred sixty-one billion, forty million, five hundred thirty-seven thousand, six hundred fifty-one".