261248039980 has 24 divisors (see below), whose sum is σ = 548730971712. Its totient is φ = 104478246912.

The previous prime is 261248039951. The next prime is 261248040019. The reversal of 261248039980 is 89930842162.

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, 1208212 + ... + 1407931.

It is an arithmetic number, because the mean of its divisors is an integer number (22863790488).

Almost surely, 2^261248039980 is an apocalyptic number.

261248039980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261248039980 is an abundant number, since it is smaller than the sum of its proper divisors (287482931732).

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

261248039980 is a wasteful number, since it uses less digits than its factorization.

261248039980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621145 (or 2621143 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 261248039980 in words is "two hundred sixty-one billion, two hundred forty-eight million, thirty-nine thousand, nine hundred eighty".