261220520167 has 8 divisors (see below), whose sum is σ = 276795833472. Its totient is φ = 245668473600.

The previous prime is 261220520161. The next prime is 261220520173. The reversal of 261220520167 is 761025022162.

It is an interprime number because it is at equal distance from previous prime (261220520161) and next prime (261220520173).

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 261220520167 - 2⁷ = 261220520039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261220520161) 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, 5793559 + ... + 5838472.

It is an arithmetic number, because the mean of its divisors is an integer number (34599479184).

Almost surely, 2^261220520167 is an apocalyptic number.

261220520167 is a deficient number, since it is larger than the sum of its proper divisors (15575313305).

261220520167 is a wasteful number, since it uses less digits than its factorization.

261220520167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11633369.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 261220520167 in words is "two hundred sixty-one billion, two hundred twenty million, five hundred twenty thousand, one hundred sixty-seven".