1641693623 has 2 divisors, whose sum is σ = 1641693624. Its totient is φ = 1641693622.

The previous prime is 1641693611. The next prime is 1641693659. The reversal of 1641693623 is 3263961461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641693623 - 2⁴ = 1641693607 is a prime.

It is a super-2 number, since 2×1641693623² = 5390315903597732258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641693023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820846811 + 820846812.

It is an arithmetic number, because the mean of its divisors is an integer number (820846812).

Almost surely, 2^1641693623 is an apocalyptic number.

1641693623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641693623 is an equidigital number, since it uses as much as digits as its factorization.

1641693623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 41.

The square root of 1641693623 is about 40517.8185863948. The cubic root of 1641693623 is about 1179.6795124561.

The spelling of 1641693623 in words is "one billion, six hundred forty-one million, six hundred ninety-three thousand, six hundred twenty-three".