1155550651554 has 64 divisors (see below), whose sum is σ = 2525933531520. Its totient is φ = 350289308160.

The previous prime is 1155550651537. The next prime is 1155550651561. The reversal of 1155550651554 is 4551560555511.

It is a happy number.

It is a super-2 number, since 2×1155550651554² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1622469 + ... + 2223399.

It is an arithmetic number, because the mean of its divisors is an integer number (39467711430).

Almost surely, 2^{1155550651554} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1155550651554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1262966765760).

1155550651554 is an abundant number, since it is smaller than the sum of its proper divisors (1370382879966).

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

1155550651554 is a wasteful number, since it uses less digits than its factorization.

1155550651554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601315.

The product of its (nonzero) digits is 1875000, while the sum is 48.

The spelling of 1155550651554 in words is "one trillion, one hundred fifty-five billion, five hundred fifty million, six hundred fifty-one thousand, five hundred fifty-four".