261610481387 has 8 divisors (see below), whose sum is σ = 269864660496. Its totient is φ = 253418598432.

The previous prime is 261610481383. The next prime is 261610481393. The reversal of 261610481387 is 783184016162.

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 261610481387 - 2² = 261610481383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261610481381) 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, 15565508 + ... + 15582305.

It is an arithmetic number, because the mean of its divisors is an integer number (33733082562).

Almost surely, 2^261610481387 is an apocalyptic number.

261610481387 is a deficient number, since it is larger than the sum of its proper divisors (8254179109).

261610481387 is a wasteful number, since it uses less digits than its factorization.

261610481387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31148077.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 261610481387 in words is "two hundred sixty-one billion, six hundred ten million, four hundred eighty-one thousand, three hundred eighty-seven".