1642664711 has 4 divisors (see below), whose sum is σ = 1677615072. Its totient is φ = 1607714352.

The previous prime is 1642664689. The next prime is 1642664773. The reversal of 1642664711 is 1174662461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1174662461 = 7 ⋅167808923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642664711 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 (1642664411) 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, 17475110 + ... + 17475203.

It is an arithmetic number, because the mean of its divisors is an integer number (419403768).

Almost surely, 2^1642664711 is an apocalyptic number.

1642664711 is a deficient number, since it is larger than the sum of its proper divisors (34950361).

1642664711 is an equidigital number, since it uses as much as digits as its factorization.

1642664711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34950360.

The product of its digits is 48384, while the sum is 38.

The square root of 1642664711 is about 40529.8002832484. The cubic root of 1642664711 is about 1179.9120663670.

The spelling of 1642664711 in words is "one billion, six hundred forty-two million, six hundred sixty-four thousand, seven hundred eleven".