261763608387 has 8 divisors (see below), whose sum is σ = 349246118080. Its totient is φ = 174395085480.

The previous prime is 261763608347. The next prime is 261763608451. The reversal of 261763608387 is 783806367162.

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

It is not a de Polignac number, because 261763608387 - 2¹⁰ = 261763607363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261763608307) 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, 28491337 + ... + 28500522.

It is an arithmetic number, because the mean of its divisors is an integer number (43655764760).

Almost surely, 2^261763608387 is an apocalyptic number.

261763608387 is a deficient number, since it is larger than the sum of its proper divisors (87482509693).

261763608387 is a wasteful number, since it uses less digits than its factorization.

261763608387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56993393.

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 261763608387 in words is "two hundred sixty-one billion, seven hundred sixty-three million, six hundred eight thousand, three hundred eighty-seven".