1555323264 has 192 divisors, whose sum is σ = 4923172800. Its totient is φ = 467389440.

The previous prime is 1555323221. The next prime is 1555323277. The reversal of 1555323264 is 4623235551.

1555323264 is a `hidden beast` number, since 15 + 553 + 2 + 32 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×1555323264² = 4838060911079227392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1760967 + ... + 1761849.

It is an arithmetic number, because the mean of its divisors is an integer number (25641525).

Almost surely, 2^1555323264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555323264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461586400).

1555323264 is an abundant number, since it is smaller than the sum of its proper divisors (3367849536).

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

1555323264 is a wasteful number, since it uses less digits than its factorization.

1555323264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1038 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 1555323264 is about 39437.5869444366. The cubic root of 1555323264 is about 1158.6178703075.

The spelling of 1555323264 in words is "one billion, five hundred fifty-five million, three hundred twenty-three thousand, two hundred sixty-four".