1616621026 has 4 divisors (see below), whose sum is σ = 2424931542. Its totient is φ = 808310512.

The previous prime is 1616620997. The next prime is 1616621047. The reversal of 1616621026 is 6201266161.

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

It can be written as a sum of positive squares in only one way, i.e., 1591611025 + 25010001 = 39895^2 + 5001^2 .

It is a super-2 number, since 2×1616621026² = 5226927083410585352, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404155255 + ... + 404155258.

Almost surely, 2^1616621026 is an apocalyptic number.

1616621026 is a deficient number, since it is larger than the sum of its proper divisors (808310516).

1616621026 is an equidigital number, since it uses as much as digits as its factorization.

1616621026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808310515.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1616621026 is about 40207.2260420935. The cubic root of 1616621026 is about 1173.6431661941.

Adding to 1616621026 its reverse (6201266161), we get a palindrome (7817887187).

The spelling of 1616621026 in words is "one billion, six hundred sixteen million, six hundred twenty-one thousand, twenty-six".