261788981015435 has 8 divisors (see below), whose sum is σ = 330680818124880. Its totient is φ = 198408490874784.

The previous prime is 261788981015431. The next prime is 261788981015489. The reversal of 261788981015435 is 534510189887162.

It is a happy number.

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 261788981015435 - 2² = 261788981015431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261788981015431) 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, 1377836742092 + ... + 1377836742281.

It is an arithmetic number, because the mean of its divisors is an integer number (41335102265610).

It is a 1-persistent number, because it is pandigital, but 2⋅261788981015435 = 523577962030870 is not.

Almost surely, 2^{261788981015435} is an apocalyptic number.

261788981015435 is a deficient number, since it is larger than the sum of its proper divisors (68891837109445).

261788981015435 is a wasteful number, since it uses less digits than its factorization.

261788981015435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755673484397.

The product of its (nonzero) digits is 116121600, while the sum is 68.

The spelling of 261788981015435 in words is "two hundred sixty-one trillion, seven hundred eighty-eight billion, nine hundred eighty-one million, fifteen thousand, four hundred thirty-five".