1155820638490 has 32 divisors (see below), whose sum is σ = 2386939912704. Its totient is φ = 394739404800.

The previous prime is 1155820638431. The next prime is 1155820638503. The reversal of 1155820638490 is 948360285511.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 32105986 + ... + 32141965.

It is an arithmetic number, because the mean of its divisors is an integer number (74591872272).

Almost surely, 2^{1155820638490} is an apocalyptic number.

1155820638490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1155820638490 is an abundant number, since it is smaller than the sum of its proper divisors (1231119274214).

1155820638490 is a wasteful number, since it uses less digits than its factorization.

1155820638490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64248222.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 1155820638490 in words is "one trillion, one hundred fifty-five billion, eight hundred twenty million, six hundred thirty-eight thousand, four hundred ninety".