1620666410 has 16 divisors (see below), whose sum is σ = 3182399712. Its totient is φ = 589333200.

The previous prime is 1620666403. The next prime is 1620666413. The reversal of 1620666410 is 146660261.

It is a super-2 number, since 2×1620666410² = 5253119225004576200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1620666413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7366556 + ... + 7366775.

It is an arithmetic number, because the mean of its divisors is an integer number (198899982).

Almost surely, 2^1620666410 is an apocalyptic number.

1620666410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620666410 is a deficient number, since it is larger than the sum of its proper divisors (1561733302).

1620666410 is a wasteful number, since it uses less digits than its factorization.

1620666410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14733349.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 1620666410 is about 40257.5012885797. The cubic root of 1620666410 is about 1174.6213139117.

The spelling of 1620666410 in words is "one billion, six hundred twenty million, six hundred sixty-six thousand, four hundred ten".