1553919977 has 2 divisors, whose sum is σ = 1553919978. Its totient is φ = 1553919976.

The previous prime is 1553919931. The next prime is 1553920001. The reversal of 1553919977 is 7799193551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1074266176 + 479653801 = 32776^2 + 21901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553919977 - 2¹⁶ = 1553854441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1553999977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776959988 + 776959989.

It is an arithmetic number, because the mean of its divisors is an integer number (776959989).

Almost surely, 2^1553919977 is an apocalyptic number.

It is an amenable number.

1553919977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553919977 is an equidigital number, since it uses as much as digits as its factorization.

1553919977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2679075, while the sum is 56.

The square root of 1553919977 is about 39419.7916914841. The cubic root of 1553919977 is about 1158.2693119813.

The spelling of 1553919977 in words is "one billion, five hundred fifty-three million, nine hundred nineteen thousand, nine hundred seventy-seven".