11231647440 has 80 divisors (see below), whose sum is σ = 37496433408. Its totient is φ = 2764712448.

The previous prime is 11231647439. The next prime is 11231647447. The reversal of 11231647440 is 4474613211.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×11231647440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231647447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1796824 + ... + 1803063.

Almost surely, 2^11231647440 is an apocalyptic number.

11231647440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11231647440 is an abundant number, since it is smaller than the sum of its proper divisors (26264785968).

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

11231647440 is a wasteful number, since it uses less digits than its factorization.

11231647440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599916 (or 3599910 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The spelling of 11231647440 in words is "eleven billion, two hundred thirty-one million, six hundred forty-seven thousand, four hundred forty".