261907380955 has 8 divisors (see below), whose sum is σ = 342860571504. Its totient is φ = 190478095200.

The previous prime is 261907380953. The next prime is 261907380989. The reversal of 261907380955 is 559083709162.

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

It is not a de Polignac number, because 261907380955 - 2¹ = 261907380953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 4761952381 = 261907380955 / (2 + 6 + 1 + 9 + 0 + 7 + 3 + 8 + 0 + 9 + 5 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 261907380896 and 261907380905.

It is not an unprimeable number, because it can be changed into a prime (261907380953) 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, 2380976136 + ... + 2380976245.

It is an arithmetic number, because the mean of its divisors is an integer number (42857571438).

Almost surely, 2^261907380955 is an apocalyptic number.

261907380955 is a deficient number, since it is larger than the sum of its proper divisors (80953190549).

261907380955 is a wasteful number, since it uses less digits than its factorization.

261907380955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761952397.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 261907380955 in words is "two hundred sixty-one billion, nine hundred seven million, three hundred eighty thousand, nine hundred fifty-five".