1554534444661 has 4 divisors (see below), whose sum is σ = 1695855757824. Its totient is φ = 1413213131500.

The previous prime is 1554534444649. The next prime is 1554534444709. The reversal of 1554534444661 is 1664444354551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1554534444661 - 2³⁹ = 1004778630773 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1554534444599 and 1554534444608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554534444601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70660656565 + ... + 70660656586.

It is an arithmetic number, because the mean of its divisors is an integer number (423963939456).

Almost surely, 2^{1554534444661} is an apocalyptic number.

1554534444661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1554534444661 is a deficient number, since it is larger than the sum of its proper divisors (141321313163).

1554534444661 is a wasteful number, since it uses less digits than its factorization.

1554534444661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141321313162.

The product of its digits is 13824000, while the sum is 52.

The spelling of 1554534444661 in words is "one trillion, five hundred fifty-four billion, five hundred thirty-four million, four hundred forty-four thousand, six hundred sixty-one".