261366415900 has 72 divisors (see below), whose sum is σ = 569272158000. Its totient is φ = 104158817280.

The previous prime is 261366415897. The next prime is 261366415903. The reversal of 261366415900 is 9514663162.

It is an interprime number because it is at equal distance from previous prime (261366415897) and next prime (261366415903).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261366415903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39246771 + ... + 39253429.

It is an arithmetic number, because the mean of its divisors is an integer number (7906557750).

Almost surely, 2^261366415900 is an apocalyptic number.

261366415900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261366415900 is an abundant number, since it is smaller than the sum of its proper divisors (307905742100).

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

261366415900 is a wasteful number, since it uses less digits than its factorization.

261366415900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8071 (or 8064 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 261366415900 in words is "two hundred sixty-one billion, three hundred sixty-six million, four hundred fifteen thousand, nine hundred".