261421770465310 has 64 divisors (see below), whose sum is σ = 579163022290944. Its totient is φ = 82733787792000.

The previous prime is 261421770465253. The next prime is 261421770465313. The reversal of 261421770465310 is 13564077124162.

It is a super-2 number, since 2×261421770465310² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421770465313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36766635 + ... + 43296985.

It is an arithmetic number, because the mean of its divisors is an integer number (9049422223296).

Almost surely, 2^{261421770465310} is an apocalyptic number.

261421770465310 is an abundant number, since it is smaller than the sum of its proper divisors (317741251825634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261421770465310 is a wasteful number, since it uses less digits than its factorization.

261421770465310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6574369.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 261421770465310 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred seventy million, four hundred sixty-five thousand, three hundred ten".