261021128624 has 40 divisors (see below), whose sum is σ = 508602864000. Its totient is φ = 129770274816.

The previous prime is 261021128611. The next prime is 261021128657. The reversal of 261021128624 is 426821120162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2771297 + ... + 2863935.

It is an arithmetic number, because the mean of its divisors is an integer number (12715071600).

Almost surely, 2^261021128624 is an apocalyptic number.

It is an amenable number.

261021128624 is a deficient number, since it is larger than the sum of its proper divisors (247581735376).

261021128624 is a wasteful number, since it uses less digits than its factorization.

261021128624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93645 (or 93639 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

Adding to 261021128624 its reverse (426821120162), we get a palindrome (687842248786).

The spelling of 261021128624 in words is "two hundred sixty-one billion, twenty-one million, one hundred twenty-eight thousand, six hundred twenty-four".