261659670000 has 100 divisors (see below), whose sum is σ = 844672399560. Its totient is φ = 69775904000.

The previous prime is 261659669951. The next prime is 261659670029. The reversal of 261659670000 is 76956162.

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4330995 + ... + 4390994.

Almost surely, 2^261659670000 is an apocalyptic number.

261659670000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261659670000 is an abundant number, since it is smaller than the sum of its proper divisors (583012729560).

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

261659670000 is an equidigital number, since it uses as much as digits as its factorization.

261659670000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8722020 (or 8721999 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 261659670000 in words is "two hundred sixty-one billion, six hundred fifty-nine million, six hundred seventy thousand".