1553977193849 has 4 divisors (see below), whose sum is σ = 1555386059136. Its totient is φ = 1552568328564.

The previous prime is 1553977193831. The next prime is 1553977193957. The reversal of 1553977193849 is 9483917793551.

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 a de Polignac number, because none of the positive numbers 2^k-1553977193849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553977193449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704430989 + ... + 704433194.

It is an arithmetic number, because the mean of its divisors is an integer number (388846514784).

Almost surely, 2^{1553977193849} is an apocalyptic number.

It is an amenable number.

1553977193849 is a deficient number, since it is larger than the sum of its proper divisors (1408865287).

1553977193849 is a wasteful number, since it uses less digits than its factorization.

1553977193849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408865286.

The product of its digits is 257191200, while the sum is 71.

The spelling of 1553977193849 in words is "one trillion, five hundred fifty-three billion, nine hundred seventy-seven million, one hundred ninety-three thousand, eight hundred forty-nine".