55323211440 has 80 divisors (see below), whose sum is σ = 196002240768. Its totient is φ = 12645305088.

The previous prime is 55323211417. The next prime is 55323211457. The reversal of 55323211440 is 4411232355.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55323211398 and 55323211407.

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, 16463562 + ... + 16466921.

Almost surely, 2^55323211440 is an apocalyptic number.

It is an amenable number.

55323211440 is an abundant number, since it is smaller than the sum of its proper divisors (140679029328).

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

55323211440 is a wasteful number, since it uses less digits than its factorization.

55323211440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32930506 (or 32930500 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 55323211440 its reverse (4411232355), we get a palindrome (59734443795).

The spelling of 55323211440 in words is "fifty-five billion, three hundred twenty-three million, two hundred eleven thousand, four hundred forty".