1234556677890 has 24 divisors (see below), whose sum is σ = 3209847362748. Its totient is φ = 329215114080.

The previous prime is 1234556677817. The next prime is 1234556677903. The reversal of 1234556677890 is 987766554321.

1234556677890 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 556 + 6 + 7 + 78 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1016662840209 + 217893837681 = 1008297^2 + 466791^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6858648121 + ... + 6858648300.

It is a 2-persistent number, because it is pandigital, and so is 2⋅1234556677890 = 2469113355780, but 3⋅1234556677890 = 3703670033670 is not.

Almost surely, 2^{1234556677890} is an apocalyptic number.

1234556677890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1234556677890 is an abundant number, since it is smaller than the sum of its proper divisors (1975290684858).

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

1234556677890 is a wasteful number, since it uses less digits than its factorization.

1234556677890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13717296434 (or 13717296431 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 1234556677890 in words is "one trillion, two hundred thirty-four billion, five hundred fifty-six million, six hundred seventy-seven thousand, eight hundred ninety".