1556856023 has 4 divisors (see below), whose sum is σ = 1557001488. Its totient is φ = 1556710560.

The previous prime is 1556856013. The next prime is 1556856101. The reversal of 1556856023 is 3206586551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1556856023 - 2¹² = 1556851927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556856013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55283 + ... + 78548.

It is an arithmetic number, because the mean of its divisors is an integer number (389250372).

Almost surely, 2^1556856023 is an apocalyptic number.

1556856023 is a deficient number, since it is larger than the sum of its proper divisors (145465).

1556856023 is a wasteful number, since it uses less digits than its factorization.

1556856023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145464.

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 1556856023 is about 39457.0148769519. The cubic root of 1556856023 is about 1158.9983483204.

The spelling of 1556856023 in words is "one billion, five hundred fifty-six million, eight hundred fifty-six thousand, twenty-three".