11961455380 has 48 divisors (see below), whose sum is σ = 28719686016. Its totient is φ = 4099328640.

The previous prime is 11961455321. The next prime is 11961455393. The reversal of 11961455380 is 8355416911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337462 + ... + 371218.

It is an arithmetic number, because the mean of its divisors is an integer number (598326792).

Almost surely, 2^11961455380 is an apocalyptic number.

11961455380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11961455380 is an abundant number, since it is smaller than the sum of its proper divisors (16758230636).

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

11961455380 is a wasteful number, since it uses less digits than its factorization.

11961455380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36304 (or 36302 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 11961455380 in words is "eleven billion, nine hundred sixty-one million, four hundred fifty-five thousand, three hundred eighty".