261660567102 has 32 divisors (see below), whose sum is σ = 575391043584. Its totient is φ = 78666739200.

The previous prime is 261660567059. The next prime is 261660567137. The reversal of 261660567102 is 201765066162.

It is a super-2 number, since 2×261660567102² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15600099 + ... + 15616862.

It is an arithmetic number, because the mean of its divisors is an integer number (17980970112).

Almost surely, 2^261660567102 is an apocalyptic number.

261660567102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

261660567102 is an abundant number, since it is smaller than the sum of its proper divisors (313730476482).

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

261660567102 is a wasteful number, since it uses less digits than its factorization.

261660567102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31217104.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 261660567102 in words is "two hundred sixty-one billion, six hundred sixty million, five hundred sixty-seven thousand, one hundred two".