1554056643 has 16 divisors (see below), whose sum is σ = 2083794336. Its totient is φ = 1030191360.

The previous prime is 1554056639. The next prime is 1554056677. The reversal of 1554056643 is 3466504551.

It is not a de Polignac number, because 1554056643 - 2² = 1554056639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1554056243) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 891753 + ... + 893493.

It is an arithmetic number, because the mean of its divisors is an integer number (130237146).

Almost surely, 2^1554056643 is an apocalyptic number.

1554056643 is a deficient number, since it is larger than the sum of its proper divisors (529737693).

1554056643 is a wasteful number, since it uses less digits than its factorization.

1554056643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 1554056643 is about 39421.5251227042. The cubic root of 1554056643 is about 1158.3032672676.

The spelling of 1554056643 in words is "one billion, five hundred fifty-four million, fifty-six thousand, six hundred forty-three".