1641011663 has 4 divisors (see below), whose sum is σ = 1668825480. Its totient is φ = 1613197848.

The previous prime is 1641011653. The next prime is 1641011699. The reversal of 1641011663 is 3661101461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3661101461 = 8689 ⋅421349.

It is a cyclic number.

It is not a de Polignac number, because 1641011663 - 2¹² = 1641007567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641011653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13906820 + ... + 13906937.

It is an arithmetic number, because the mean of its divisors is an integer number (417206370).

Almost surely, 2^1641011663 is an apocalyptic number.

1641011663 is a deficient number, since it is larger than the sum of its proper divisors (27813817).

1641011663 is an equidigital number, since it uses as much as digits as its factorization.

1641011663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27813816.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1641011663 is about 40509.4021555490. The cubic root of 1641011663 is about 1179.5161434306.

The spelling of 1641011663 in words is "one billion, six hundred forty-one million, eleven thousand, six hundred sixty-three".