1554056420621 has 4 divisors (see below), whose sum is σ = 1583378239932. Its totient is φ = 1524734601312.

The previous prime is 1554056420611. The next prime is 1554056420677. The reversal of 1554056420621 is 1260246504551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1285332375625 + 268724044996 = 1133725^2 + 518386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1554056420621 - 2²⁶ = 1553989311757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554056420611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14660909576 + ... + 14660909681.

It is an arithmetic number, because the mean of its divisors is an integer number (395844559983).

Almost surely, 2^{1554056420621} is an apocalyptic number.

It is an amenable number.

1554056420621 is a deficient number, since it is larger than the sum of its proper divisors (29321819311).

1554056420621 is an equidigital number, since it uses as much as digits as its factorization.

1554056420621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29321819310.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 1554056420621 in words is "one trillion, five hundred fifty-four billion, fifty-six million, four hundred twenty thousand, six hundred twenty-one".