261595211620 has 48 divisors (see below), whose sum is σ = 553157716608. Its totient is φ = 103913222400.

The previous prime is 261595211617. The next prime is 261595211621. The reversal of 261595211620 is 26112595162.

It is not an unprimeable number, because it can be changed into a prime (261595211621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11473672 + ... + 11496448.

It is an arithmetic number, because the mean of its divisors is an integer number (11524119096).

Almost surely, 2^261595211620 is an apocalyptic number.

261595211620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261595211620 is an abundant number, since it is smaller than the sum of its proper divisors (291562504988).

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

261595211620 is a wasteful number, since it uses less digits than its factorization.

261595211620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26740 (or 26738 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 261595211620 in words is "two hundred sixty-one billion, five hundred ninety-five million, two hundred eleven thousand, six hundred twenty".