1555642023 has 32 divisors (see below), whose sum is σ = 2301432000. Its totient is φ = 928475136.

The previous prime is 1555642019. The next prime is 1555642087. The reversal of 1555642023 is 3202465551.

It is not a de Polignac number, because 1555642023 - 2² = 1555642019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555642723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 502063 + ... + 505151.

It is an arithmetic number, because the mean of its divisors is an integer number (71919750).

Almost surely, 2^1555642023 is an apocalyptic number.

1555642023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1555642023 is a deficient number, since it is larger than the sum of its proper divisors (745789977).

1555642023 is a wasteful number, since it uses less digits than its factorization.

1555642023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 1555642023 is about 39441.6280470267. The cubic root of 1555642023 is about 1158.6970166935.

The spelling of 1555642023 in words is "one billion, five hundred fifty-five million, six hundred forty-two thousand, twenty-three".