1556401016 has 8 divisors (see below), whose sum is σ = 2918251920. Its totient is φ = 778200504.

The previous prime is 1556400991. The next prime is 1556401027. The reversal of 1556401016 is 6101046551.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1556401016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97275056 + ... + 97275071.

It is an arithmetic number, because the mean of its divisors is an integer number (364781490).

Almost surely, 2^1556401016 is an apocalyptic number.

It is an amenable number.

1556401016 is a deficient number, since it is larger than the sum of its proper divisors (1361850904).

1556401016 is a wasteful number, since it uses less digits than its factorization.

1556401016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194550133 (or 194550129 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1556401016 is about 39451.2485987453. The cubic root of 1556401016 is about 1158.8854276356.

Adding to 1556401016 its reverse (6101046551), we get a palindrome (7657447567).

The spelling of 1556401016 in words is "one billion, five hundred fifty-six million, four hundred one thousand, sixteen".