1553233021979 has 2 divisors, whose sum is σ = 1553233021980. Its totient is φ = 1553233021978.

The previous prime is 1553233021927. The next prime is 1553233022009. The reversal of 1553233021979 is 9791203323551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1553233021979 - 2¹² = 1553233017883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1553233021919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776616510989 + 776616510990.

It is an arithmetic number, because the mean of its divisors is an integer number (776616510990).

Almost surely, 2^{1553233021979} is an apocalyptic number.

1553233021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553233021979 is an equidigital number, since it uses as much as digits as its factorization.

1553233021979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1530900, while the sum is 50.

The spelling of 1553233021979 in words is "one trillion, five hundred fifty-three billion, two hundred thirty-three million, twenty-one thousand, nine hundred seventy-nine".