1641616615 has 4 divisors (see below), whose sum is σ = 1969939944. Its totient is φ = 1313293288.

The previous prime is 1641616609. The next prime is 1641616621. The reversal of 1641616615 is 5166161461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5166161461 = 23369 ⋅221069.

It is an interprime number because it is at equal distance from previous prime (1641616609) and next prime (1641616621).

It is a cyclic number.

It is not a de Polignac number, because 1641616615 - 2¹⁷ = 1641485543 is a prime.

It is a super-2 number, since 2×1641616615² = 5389810221288116450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164161657 + ... + 164161666.

It is an arithmetic number, because the mean of its divisors is an integer number (492484986).

Almost surely, 2^1641616615 is an apocalyptic number.

1641616615 is a deficient number, since it is larger than the sum of its proper divisors (328323329).

1641616615 is an equidigital number, since it uses as much as digits as its factorization.

1641616615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328323328.

The product of its digits is 25920, while the sum is 37.

The square root of 1641616615 is about 40516.8682772990. The cubic root of 1641616615 is about 1179.6610668340.

The spelling of 1641616615 in words is "one billion, six hundred forty-one million, six hundred sixteen thousand, six hundred fifteen".