1554991542049 has 9 divisors (see below), whose sum is σ = 1709220656689. Its totient is φ = 1413616204660.

The previous prime is 1554991542037. The next prime is 1554991542077. The reversal of 1554991542049 is 9402451994551.

The square root of 1554991542049 is 1246993.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1554991542049 - 2⁷ = 1554991541921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1554991541984 and 1554991542002.

It is not an unprimeable number, because it can be changed into a prime (1554991542079) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13660242 + ... + 13773604.

Almost surely, 2^{1554991542049} is an apocalyptic number.

1554991542049 is the 1246993-rd square number.

1554991542049 is the 623497-th centered octagonal number.

It is an amenable number.

1554991542049 is a deficient number, since it is larger than the sum of its proper divisors (154229114640).

1554991542049 is an frugal number, since it uses more digits than its factorization.

1554991542049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226748 (or 113374 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 58.

The spelling of 1554991542049 in words is "one trillion, five hundred fifty-four billion, nine hundred ninety-one million, five hundred forty-two thousand, forty-nine".