1550404121985 has 48 divisors (see below), whose sum is σ = 2706073965504. Its totient is φ = 821146225536.

The previous prime is 1550404121963. The next prime is 1550404122019. The reversal of 1550404121985 is 5891214040551.

1550404121985 is a `hidden beast` number, since 1 + 5 + 5 + 0 + 40 + 412 + 198 + 5 = 666.

It is not a de Polignac number, because 1550404121985 - 2⁷ = 1550404121857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1550404121985.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3523602 + ... + 3939108.

It is an arithmetic number, because the mean of its divisors is an integer number (56376540948).

Almost surely, 2^{1550404121985} is an apocalyptic number.

1550404121985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1550404121985 is a deficient number, since it is larger than the sum of its proper divisors (1155669843519).

1550404121985 is a wasteful number, since it uses less digits than its factorization.

1550404121985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416094 (or 416091 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The spelling of 1550404121985 in words is "one trillion, five hundred fifty billion, four hundred four million, one hundred twenty-one thousand, nine hundred eighty-five".