261650447001100 has 36 divisors (see below), whose sum is σ = 567952334833464. Its totient is φ = 104628682977280.

The previous prime is 261650447000977. The next prime is 261650447001101. The reversal of 261650447001100 is 1100744056162.

It is a self number, because there is not a number n which added to its sum of digits gives 261650447001100.

It is not an unprimeable number, because it can be changed into a prime (261650447001101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393363829 + ... + 394028428.

It is an arithmetic number, because the mean of its divisors is an integer number (15776453745374).

Almost surely, 2^{261650447001100} is an apocalyptic number.

261650447001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261650447001100 is an abundant number, since it is smaller than the sum of its proper divisors (306301887832364).

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

261650447001100 is a wasteful number, since it uses less digits than its factorization.

261650447001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787395594 (or 787395587 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 261650447001100 in words is "two hundred sixty-one trillion, six hundred fifty billion, four hundred forty-seven million, one thousand, one hundred".