261420257215 has 32 divisors (see below), whose sum is σ = 339646712832. Its totient is φ = 192014928000.

The previous prime is 261420257201. The next prime is 261420257257. The reversal of 261420257215 is 512752024162.

It is not a de Polignac number, because 261420257215 - 2¹³ = 261420249023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26478730 + ... + 26488600.

It is an arithmetic number, because the mean of its divisors is an integer number (10613959776).

Almost surely, 2^261420257215 is an apocalyptic number.

261420257215 is a deficient number, since it is larger than the sum of its proper divisors (78226455617).

261420257215 is a wasteful number, since it uses less digits than its factorization.

261420257215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12031.

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 261420257215 in words is "two hundred sixty-one billion, four hundred twenty million, two hundred fifty-seven thousand, two hundred fifteen".