1642006556 has 6 divisors (see below), whose sum is σ = 2873511480. Its totient is φ = 821003276.

The previous prime is 1642006549. The next prime is 1642006567. The reversal of 1642006556 is 6556002461.

It is a super-2 number, since 2×1642006556² = 5392371059893962272, which contains 22 as substring.

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, 205250816 + ... + 205250823.

It is an arithmetic number, because the mean of its divisors is an integer number (478918580).

Almost surely, 2^1642006556 is an apocalyptic number.

It is an amenable number.

1642006556 is a deficient number, since it is larger than the sum of its proper divisors (1231504924).

1642006556 is a wasteful number, since it uses less digits than its factorization.

1642006556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410501643 (or 410501641 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1642006556 is about 40521.6800737580. The cubic root of 1642006556 is about 1179.7544629402.

The spelling of 1642006556 in words is "one billion, six hundred forty-two million, six thousand, five hundred fifty-six".