1556297668 has 24 divisors (see below), whose sum is σ = 2860062912. Its totient is φ = 739568544.

The previous prime is 1556297653. The next prime is 1556297683. The reversal of 1556297668 is 8667926551.

It is an interprime number because it is at equal distance from previous prime (1556297653) and next prime (1556297683).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39430 + ... + 68317.

It is an arithmetic number, because the mean of its divisors is an integer number (119169288).

Almost surely, 2^1556297668 is an apocalyptic number.

It is an amenable number.

1556297668 is a deficient number, since it is larger than the sum of its proper divisors (1303765244).

1556297668 is a wasteful number, since it uses less digits than its factorization.

1556297668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107931 (or 107929 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The square root of 1556297668 is about 39449.9387578739. The cubic root of 1556297668 is about 1158.8597763326.

The spelling of 1556297668 in words is "one billion, five hundred fifty-six million, two hundred ninety-seven thousand, six hundred sixty-eight".