1553671998 has 24 divisors (see below), whose sum is σ = 3429806328. Its totient is φ = 508118832.

The previous prime is 1553671979. The next prime is 1553672017. The reversal of 1553671998 is 8991763551.

1553671998 is a `hidden beast` number, since 1 + 5 + 536 + 7 + 19 + 98 = 666.

It is an interprime number because it is at equal distance from previous prime (1553671979) and next prime (1553672017).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813340 + ... + 815247.

It is an arithmetic number, because the mean of its divisors is an integer number (142908597).

Almost surely, 2^1553671998 is an apocalyptic number.

1553671998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1553671998 is an abundant number, since it is smaller than the sum of its proper divisors (1876134330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1553671998 is a wasteful number, since it uses less digits than its factorization.

1553671998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628648 (or 1628645 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 1553671998 is about 39416.6462043640. The cubic root of 1553671998 is about 1158.2076953922.

The spelling of 1553671998 in words is "one billion, five hundred fifty-three million, six hundred seventy-one thousand, nine hundred ninety-eight".