261421727730760 has 32 divisors (see below), whose sum is σ = 588206191406400. Its totient is φ = 104567392601280.

The previous prime is 261421727730749. The next prime is 261421727730769. The reversal of 261421727730760 is 67037727124162.

It is a super-2 number, since 2×261421727730760² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261421727730769) 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, 37313100 + ... + 43761979.

It is an arithmetic number, because the mean of its divisors is an integer number (18381443481450).

Almost surely, 2^{261421727730760} is an apocalyptic number.

261421727730760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261421727730760 is an abundant number, since it is smaller than the sum of its proper divisors (326784463675640).

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

261421727730760 is a wasteful number, since it uses less digits than its factorization.

261421727730760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81155701 (or 81155697 counting only the distinct ones).

The product of its (nonzero) digits is 8297856, while the sum is 55.

The spelling of 261421727730760 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred twenty-seven million, seven hundred thirty thousand, seven hundred sixty".